Writeup and minor changes for v1.4

v1.3 arrived and all functionality was confirmed working. This commit
adds the writeup, license, and some small modifications to the PCB to
make it a little easier to use.

* PCB updated to clarify assembly and use (text enlarged, dual 1x3 headers for reversible UART changed to single 2x3P using custom symbol).
* Vdd for JTAG and UART disconnected from each other on adapter, allowing different voltage to be used for each.
* Connected nRST line of ESP-PROG (from UART header) to board RESET line on JTAG pinout with solderjumper.
* Default connected solderjumpers changed to default open for Reversible UART, since I anticipate it'll be more used than not.

Author: 0xjmux

LICENSE.md

@@ -0,0 +1,199 @@
+CERN Open Hardware Licence Version 2 - Permissive
+
+
+Preamble
+
+CERN has developed this licence to promote collaboration among
+hardware designers and to provide a legal tool which supports the
+freedom to use, study, modify, share and distribute hardware designs
+and products based on those designs. Version 2 of the CERN Open
+Hardware Licence comes in three variants: this licence, CERN-OHL-P
+(permissive); and two reciprocal licences: CERN-OHL-W (weakly
+reciprocal) and CERN-OHL-S (strongly reciprocal).
+
+The CERN-OHL-P is copyright CERN 2020. Anyone is welcome to use it, in
+unmodified form only.
+
+Use of this Licence does not imply any endorsement by CERN of any
+Licensor or their designs nor does it imply any involvement by CERN in
+their development.
+
+
+1 Definitions
+
+  1.1 'Licence' means this CERN-OHL-P.
+
+  1.2 'Source' means information such as design materials or digital
+      code which can be applied to Make or test a Product or to
+      prepare a Product for use, Conveyance or sale, regardless of its
+      medium or how it is expressed. It may include Notices.
+
+  1.3 'Covered Source' means Source that is explicitly made available
+      under this Licence.
+
+  1.4 'Product' means any device, component, work or physical object,
+      whether in finished or intermediate form, arising from the use,
+      application or processing of Covered Source.
+
+  1.5 'Make' means to create or configure something, whether by
+      manufacture, assembly, compiling, loading or applying Covered
+      Source or another Product or otherwise.
+
+  1.6 'Notice' means copyright, acknowledgement and trademark notices,
+      references to the location of any Notices, modification notices
+      (subsection 3.3(b)) and all notices that refer to this Licence
+      and to the disclaimer of warranties that are included in the
+      Covered Source.
+
+  1.7 'Licensee' or 'You' means any person exercising rights under
+      this Licence.
+
+  1.8 'Licensor' means a person who creates Source or modifies Covered
+      Source and subsequently Conveys the resulting Covered Source
+      under the terms and conditions of this Licence. A person may be
+      a Licensee and a Licensor at the same time.
+
+  1.9 'Convey' means to communicate to the public or distribute.
+
+
+2 Applicability
+
+  2.1 This Licence governs the use, copying, modification, Conveying
+      of Covered Source and Products, and the Making of Products. By
+      exercising any right granted under this Licence, You irrevocably
+      accept these terms and conditions.
+
+  2.2 This Licence is granted by the Licensor directly to You, and
+      shall apply worldwide and without limitation in time.
+
+  2.3 You shall not attempt to restrict by contract or otherwise the
+      rights granted under this Licence to other Licensees.
+
+  2.4 This Licence is not intended to restrict fair use, fair dealing,
+      or any other similar right.
+
+
+3 Copying, Modifying and Conveying Covered Source
+
+  3.1 You may copy and Convey verbatim copies of Covered Source, in
+      any medium, provided You retain all Notices.
+
+  3.2 You may modify Covered Source, other than Notices.
+
+      You may only delete Notices if they are no longer applicable to
+      the corresponding Covered Source as modified by You and You may
+      add additional Notices applicable to Your modifications.
+
+  3.3 You may Convey modified Covered Source (with the effect that You
+      shall also become a Licensor) provided that You:
+
+       a) retain Notices as required in subsection 3.2; and
+
+       b) add a Notice to the modified Covered Source stating that You
+          have modified it, with the date and brief description of how
+          You have modified it.
+
+  3.4 You may Convey Covered Source or modified Covered Source under
+      licence terms which differ from the terms of this Licence
+      provided that You:
+
+       a) comply at all times with subsection 3.3; and
+
+       b) provide a copy of this Licence to anyone to whom You
+          Convey Covered Source or modified Covered Source.
+
+
+4 Making and Conveying Products
+
+You may Make Products, and/or Convey them, provided that You ensure
+that the recipient of the Product has access to any Notices applicable
+to the Product.
+
+
+5 DISCLAIMER AND LIABILITY
+
+  5.1 DISCLAIMER OF WARRANTY -- The Covered Source and any Products
+      are provided 'as is' and any express or implied warranties,
+      including, but not limited to, implied warranties of
+      merchantability, of satisfactory quality, non-infringement of
+      third party rights, and fitness for a particular purpose or use
+      are disclaimed in respect of any Source or Product to the
+      maximum extent permitted by law. The Licensor makes no
+      representation that any Source or Product does not or will not
+      infringe any patent, copyright, trade secret or other
+      proprietary right. The entire risk as to the use, quality, and
+      performance of any Source or Product shall be with You and not
+      the Licensor. This disclaimer of warranty is an essential part
+      of this Licence and a condition for the grant of any rights
+      granted under this Licence.
+
+  5.2 EXCLUSION AND LIMITATION OF LIABILITY -- The Licensor shall, to
+      the maximum extent permitted by law, have no liability for
+      direct, indirect, special, incidental, consequential, exemplary,
+      punitive or other damages of any character including, without
+      limitation, procurement of substitute goods or services, loss of
+      use, data or profits, or business interruption, however caused
+      and on any theory of contract, warranty, tort (including
+      negligence), product liability or otherwise, arising in any way
+      in relation to the Covered Source, modified Covered Source
+      and/or the Making or Conveyance of a Product, even if advised of
+      the possibility of such damages, and You shall hold the
+      Licensor(s) free and harmless from any liability, costs,
+      damages, fees and expenses, including claims by third parties,
+      in relation to such use.
+
+
+6 Patents
+
+  6.1 Subject to the terms and conditions of this Licence, each
+      Licensor hereby grants to You a perpetual, worldwide,
+      non-exclusive, no-charge, royalty-free, irrevocable (except as
+      stated in this section 6, or where terminated by the Licensor
+      for cause) patent licence to Make, have Made, use, offer to
+      sell, sell, import, and otherwise transfer the Covered Source
+      and Products, where such licence applies only to those patent
+      claims licensable by such Licensor that are necessarily
+      infringed by exercising rights under the Covered Source as
+      Conveyed by that Licensor.
+
+  6.2 If You institute patent litigation against any entity (including
+      a cross-claim or counterclaim in a lawsuit) alleging that the
+      Covered Source or a Product constitutes direct or contributory
+      patent infringement, or You seek any declaration that a patent
+      licensed to You under this Licence is invalid or unenforceable
+      then any rights granted to You under this Licence shall
+      terminate as of the date such process is initiated.
+
+
+7 General
+
+  7.1 If any provisions of this Licence are or subsequently become
+      invalid or unenforceable for any reason, the remaining
+      provisions shall remain effective.
+
+  7.2 You shall not use any of the name (including acronyms and
+      abbreviations), image, or logo by which the Licensor or CERN is
+      known, except where needed to comply with section 3, or where
+      the use is otherwise allowed by law. Any such permitted use
+      shall be factual and shall not be made so as to suggest any kind
+      of endorsement or implication of involvement by the Licensor or
+      its personnel.
+
+  7.3 CERN may publish updated versions and variants of this Licence
+      which it considers to be in the spirit of this version, but may
+      differ in detail to address new problems or concerns. New
+      versions will be published with a unique version number and a
+      variant identifier specifying the variant. If the Licensor has
+      specified that a given variant applies to the Covered Source
+      without specifying a version, You may treat that Covered Source
+      as being released under any version of the CERN-OHL with that
+      variant. If no variant is specified, the Covered Source shall be
+      treated as being released under CERN-OHL-S. The Licensor may
+      also specify that the Covered Source is subject to a specific
+      version of the CERN-OHL or any later version in which case You
+      may apply this or any later version of CERN-OHL with the same
+      variant identifier published by CERN.
+
+  7.4 This Licence shall not be enforceable except by a Licensor
+      acting as such, and third party beneficiary rights are
+      specifically excluded.