Create CONTRIBUTING.md

CONTRIBUTING.md

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+# A real support for GINPA is available
+
+Hello there ! If you are on this page, you should "match" one of the cases below:
+
+1. **You wanna contribute in order to improve GINPA**: Awesome !
+
+2. **You are encountering some problems with our software**: It happens... sometimes.
+
+3. **Something in the install and / or execution procedures just DOES NOT work as well**: Well, we'd be here !
+
+4. **You really need some help from the developpers**: We'd be here too !
+
+... we invite you to check out the correspondant answer in these categories:
+
+### I - How can I contribute to GINPA ?
+
+This is pretty simple. You just have to fork this project on your own, and ask a pull request.
+Your modifications would be integrated to the original project if we validate them !
+
+### II - What is this error I got ? Is something definitely missing ? :angry:
+
+It is very likely that we forgot some possibilities, and some features may not work as expected on each environment.  
+What we propose is that you open an issue on GitHub.  
+We can assure you that you should get an answer quickly, and a working patch within some days ('cause we would have some others projects on the go :smirk:).
+
+### III - I can't even run this piece of **** of software, what can I do ?
+
+Yeah, that's also possible :neutral_face:. Just contact us by opening an issue.  
+And if you could gather some technical information of your system, it would be perfect and pretty helpful !
+
+### IV - I found something out in your source code I don't understand...
+
+Well, one of us forgot to put some important explanations then :smile:, or you can't translate sentances into your language !  
+Just leave a little comment on the latest commit attached to the file with that piece of code, and we'll bring some help :wink:
+
+======
+
+Thanks for the reading !