Create a CONTRIBUTING.md file

[nulltoken]

Help user with some information regarding the most efficient way to

• Report issues (library version, repro case, ...)
• Contribute code

Below some potentially useful source of inspiration regarding potential structure, content or wording:

• https://github.com/Haacked/SeeGit/blob/master/CONTRIBUTING.md
• https://github.com/blog/1184-contributing-guidelines
• https://github.com/dahlbyk/up-for-grabs.net/pull/14/files
• https://github.com/contribute-md/contribute-md-template/blob/master/contribute.md
• https://github.com/yeoman/yeoman/blob/master/contributing.md
• https://github.com/dradis/dradisframework/blob/master/CONTRIBUTING.md
• https://github.com/baconstarvation/flight-menu-example/blob/master/CONTRIBUTING.md
• http://git.libssh2.org/?p=libssh2.git;a=blob;f=HACKING;h=5da8e66c23ae4e6cfc66560698b199ecb337750d;hb=HEAD;js=1
• https://github.com/joyent/libuv/blob/master/CONTRIBUTING.md
• https://github.com/MSOpenTech/ChassisManager/wiki/how-to-contribute
• https://github.com/Pash-Project/Pash/blob/master/CONTRIBUTING.md
• https://github.com/OneGet/oneget/blob/master/readme.md
• http://www.snipe.net/2014/11/how-to-contribute-to-open-source-without-being-a-dick/
• https://github.com/scriptcs/scriptcs/blob/master/CONTRIBUTING.md
• https://github.com/Microsoft/dotnet/blob/master/CONTRIBUTING.md

[hahmed]

@nulltoken not sure if anyone has done this or is working on it, I cannot see anything in the PRs.

Anyway, I got this one

[carlosmn]

Fixed via #887