nit: Added `CONTRIBUTING.md` file to repository

Signed-off-by: Lucas Bajolet <r4pass@hotmail.com>

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+# Contributing to Nit
+
+Thank you for your interest in contributing to Nit!
+We accept all forms of contribution, ranging from small example programs to improvements and additions to the libraries and posting of issues.
+
+
+## Contribution process
+
+All the contributions to the Nit language, its tools and libraries, are done through Github Pull-Requests.
+
+All the information on our contribution policy is available on our [website](http://nitlanguage.org/internal/).
+We encourage you to take a look at the sections available here for a walthrough of what is required to submit a new PR.
+
+## Other suggestions
+
+We are always open for suggestions or any other kind of contribution.
+
+If you do not want to submit code for some reason, you are always welcome to ask questions about the language or related topics via the issue system.
+
+You may also proof-read and correct documentation if you are willing!
+All the documents on this repository are written in English, however most of our contributors are not native anglophones.
+Therefore we encourage people, especially those coming of an english-speaking culture to read the documentation available and submit patches to correct bad formulations, typos or related mistakes on our part through the usual system.