Update AUTHORS.md with all contributors and CLA

 Add some CLA info and update CLA assistant record based on old
 `Signed-off-by` lines
 [ci skip]

Author: zbeekman

AUTHORS.md

@@ -1,22 +1,97 @@
+<a name="top"> </a>
+
+
+[This document is formatted with GitHub-Flavored Markdown.               ]:#
+[For better viewing, including hyperlinks, read it online at             ]:#
+[https://github.com/sourceryinstitute/opencoarrays/blob/master/AUTHORS.md]:#
+
 Contributors to OpenCoarrays
 ============================
 
+[![CLA assistant][CLA img]](https://cla-assistant.io/sourceryinstitute/opencoarrays)
 [![Download as PDF][pdf img]](http://md2pdf.herokuapp.com/sourceryinstitute/opencoarrays/blob/master/AUTHORS.pdf)
 
 Download this file as a PDF document
-[here](http://md2pdf.herokuapp.com/sourceryinstitute/opencoarrays/blob/master/AUTHORS.pdf).
+[here][pdfloc].
+
+ - [X] Alessandro Fanfarillo  <[email protected]>
+ - [X] Damian Rouson  <[email protected]>
+ - [X] Izaak "Zaak" Beekman  <https://izaakbeekman.com> [@zbeekman](https://twitter.com/zbeekman)
+ - [X] Tobias Burnus  <[email protected]>
+ - [X] Andre Vehreschild <[email protected]>
+ - [X] Craig Rasmussen <[email protected]>
+ - [X] Jeff Hammond  <[email protected]>
+ - [ ] Salvatore Filippone <[email protected]>
+ - [ ] Raul Laasner <[email protected]>
+ - [X] Naveen Ravi <[email protected]>
+ - [X] Soren Rasmussen <[email protected]>
+ - [X] LaHaine <[email protected]>
+ - [ ] John C. Linford <[email protected]>
+ - [ ] Götz Waschk <[email protected]>
+ - [ ] Daniel Carrera  <[email protected]>
+
+[top]
+
+Linux Foundation Contributor License Agreement (CLA)
+----------------------------------------------------
+
+All contributors are expected to sign the [Linux Foundation Contributor
+License Agreement (CLA), the "Developer Certificate of Origin",
+Version 1.1.](https://gist.github.com/zbeekman/0a5d60a1cbd1f6a8cfa5)
+using the [CLA-Assistant]
+
+```
+Developer Certificate of Origin
+Version 1.1
+
+Copyright (C) 2004, 2006 The Linux Foundation and its contributors.
+660 York Street, Suite 102,
+San Francisco, CA 94110 USA
+
+Everyone is permitted to copy and distribute verbatim copies of this
+license document, but changing it is not allowed.
+
+
+Developer's Certificate of Origin 1.1
+
+By making a contribution to this project, I certify that:
+
+(a) The contribution was created in whole or in part by me and I
+    have the right to submit it under the open source license
+    indicated in the file; or
+
+(b) The contribution is based upon previous work that, to the best
+    of my knowledge, is covered under an appropriate open source
+    license and I have the right under that license to submit that
+    work with modifications, whether created in whole or in part
+    by me, under the same open source license (unless I am
+    permitted to submit under a different license), as indicated
+    in the file; or
+
+(c) The contribution was provided directly to me by some other
+    person who certified (a), (b) or (c) and I have not modified
+    it.
+
+(d) I understand and agree that this project and the contribution
+    are public and that a record of the contribution (including all
+    personal information I submit with it, including my sign-off) is
+    maintained indefinitely and may be redistributed consistent with
+    this project or the open source license(s) involved.
+```
+
+[top]
 
- - Alessandro Fanfarillo  <[email protected]>
- - Damian Rouson  <[email protected]>
- - Izaak Beekman  <http://izaakbeekman.com>
- - Daniel Carrera  <[email protected]>
- - Jeff Hammond  <[email protected]>
- - Tobias Burnus  <[email protected]>
+---
 
-[I think we're missing a number of people here]:#
-[@naveen-rn?]:#
-[@raul-nasner?]:#
-[Others:]:#
+[![GitHub forks](https://img.shields.io/github/forks/sourceryinstitute/opencoarrays.svg?style=social&label=Fork)](https://github.com/sourceryinstitute/opencoarrays/fork)
+[![GitHub stars](https://img.shields.io/github/stars/sourceryinstitute/opencoarrays.svg?style=social&label=Star)](https://github.com/sourceryinstitute/opencoarrays)
+[![GitHub watchers](https://img.shields.io/github/watchers/sourceryinstitute/opencoarrays.svg?style=social&label=Watch)](https://github.com/sourceryinstitute/opencoarrays)
+[![Twitter URL](https://img.shields.io/twitter/url/http/shields.io.svg?style=social)](https://twitter.com/intent/tweet?hashtags=HPC,Fortran,PGAS&related=zbeekman,gnutools,HPCwire,HPC_Guru,hpcprogrammer,SciNetHPC,DegenerateConic,jeffdotscience,travisci&text=Stop%20programming%20w%2F%20the%20%23MPI%20docs%20in%20your%20lap%2C%20try%20Coarray%20Fortran%20w%2F%20OpenCoarrays%20%26%20GFortran!&url=https%3A//github.com/sourceryinstitute/opencoarrays)
 
 [Links]:#
 [pdf img]: https://img.shields.io/badge/PDF-AUTHORS.md-6C2DC7.svg?style=flat-square "Download as PDF"
+[contributor img]: https://img.shields.io/github/contributors/sourceryinstitute/opencoarrays.svg?style=flat-square "Contributors"
+[CLA img]: https://cla-assistant.io/readme/badge/sourceryinstitute/opencoarrays "CLA signees"
+[pdfloc]: http://md2pdf.herokuapp.com/sourceryinstitute/opencoarrays/blob/master/AUTHORS.pdf "Get this file as a PDF document"
+[CLA-Assistant]: https://cla-assistant.io/sourceryinstitute/opencoarrays "CLA-Assistant"
+[top]: #top