Create Contributing.md

Contributing.md

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+# How to contribute
+I'm really glad you're reading this, because we need volunteer developers to help this project come to fruition.
+
+## Testing
+
+We want people to test our builds on different linux systems and report all the issues to make the installer more robust.
+
+## Submitting changes
+
+Please send a GitHub Pull Request with a clear list of what you've done (read more about pull requests). When you send a pull request. We can always use more test coverage. Make sure all of your commits are atomic (one feature per commit).
+
+Always write a clear log message for your commits. One-line messages are fine for small changes, but bigger changes should look like this:
+
+```
+$ git commit -m "A brief summary of the commit
+> 
+> A paragraph describing what changed and its impact."
+```