update readme, add license

Author: dmke

LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2016 Digineo GmbH
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

@@ -1,26 +1,71 @@
 HTTP over SSH
 =============
 
-This dynamic HTTP proxy tunnels your HTTP requests through SSH connections using public key authentication.
-It is not recommended for production use.
+This dynamic HTTP proxy tunnels your HTTP requests through SSH connections
+using public key authentication. The intention to develop this program is
+the requirement of polling [Prometheus exporters][promexp] through SSH.
 
-The intention to develope this program is the requirement of polling [Prometheus exporters](https://prometheus.io/docs/instrumenting/exporters/) through SSH.
+> **It is not recommended for production use, yet.**
+
+[promexp]: https://prometheus.io/docs/instrumenting/exporters/
 
 ## Syntax
 
     http://<proxy-address>/<ssh-address>/<destination-host>/<destination-path>
 
 
-## Example
+## Usage
+
+After installation (see below), start the proxy on `localhost:8000`:
+
+```console
+$ http-over-ssh -listen 127.0.0.1:8000
+```
+
+For a full list of options run `http-over-ssh -help`.
+
+If you want to fetch http://example.com/index.html via `root@jumphost.tld:22`,
+just fetch this URL instead:
+
+    http://localhost:8080/root@jumphost.tld:22/example.com:80/index.html
+
+For `<ssh-address>`, the defaults for username and port are "root" and 22.
+The following fetch URL is hence equivalent:
+
+    http://localhost:8080/jumphost.tld/example.com:80/index.html
+
+For the `<destination-host>` is currently only HTTP allowed. This might
+change in the future, but requires a change in the fetch URL syntax.
 
-Your proxy is reachable at `localhost:8000` and you want to fetch http://example.com/index.html via `jumphost.tld:22`.
-Then just fetch:
+Parsing IPv6 addresses for both `<ssh-address>` and `<destination-host>`
+is currently buggy as well.
 
-    http://localhost:8080/jumphost.tld:22/example.com:80/index.html
+Please [open an issue][issues] if you need one those features.
 
+[issues]: https://github.com/digineo/http-over-ssh/issues
+
+
+## Installation
+
+If you have the Go toolchain installed, a simple
+
+```console
+$ go get github.com/digineo/http-over-ssh
+```
+
+will place a `http-over-ssh` binary in `$GOPATH/bin/`.
+
+Alternatively, you may download a pre-built binary from the Github
+[release page][releases] and extract the binary into your `$PATH`.
+
+[releases]: https://github.com/digineo/http-over-ssh/releases
 
 ## Next steps
 
 - [ ] stability improvements
 - [ ] clean up idle ssh connections
 - [ ] support for unix sockets
+
+## License
+
+MIT Licence. Copyright 2018, Digineo GmbH