Create CONTRIBUTING.md

CONTRIBUTING.md

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+# Contributing
+
+We encourage anyone to contribute issues, feedback and so on via logging an issue. Once the OWASP Top 10 has been released, 
+it might be a while before that feedback is incorporated into the next version (up to 3 years). 
+
+# Translations
+
+If you are interested in translating the OWASP Top 10, please contact @owasptop10 on Twitter - someone else might already be working on 
+your language, and you can help that effort instead of doing it over. Generally, we will create a project for you, or you can fork the main 
+repo and provide us a pull request once you're done. To maintain traceability, we do ask that you translate the markdown as well, as that's 
+what is included in the Wiki version. 
+
+# Forking
+
+You are more than welcome to fork the OWASP Top 10, but please abide by the Creative Commons BY-SA 4.0 license. 
+
+# Pull requests
+
+We welcome pull requests for fixes, but again, it might be a while before we accept any changes to the final version of the OWASP Top 10. 
+
+
+