Adds Contributing.md

Author: dresende

Contributing.md

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+## Contributing
+
+### Issues
+
+Try to be the most specific possible. Give node version, database driver and orm version. Give an example,
+that will help other people to try and replicate your problem.
+
+### Pull Requests
+
+They are always welcome, but they must pass all the tests. If adding a new feature, don't forget about adding
+it to documentation (Readme.md) and add tests for it. If you need help preparing a local clone for testing
+just ask and we'll help you.