Create CONTRIBUTING.md

Author: tot0p

Diff for: CONTRIBUTING.md

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+# CONTRIBUTING
+
+if you want to add one hello world in a language who is not in this repo
+
+you must respect 3 rules :
+
+ - create a new dir with the name of the programming language 
+ - add a code file with the right extension **ONLY** (for example : for a compiled language , do not put the binary file)
+ - add a `readme.md` to explain how to run the script and link of the language (you can see an example [here](/Python/Readme.md))