Add contributing guidelines to CONTRIBUTING.md

Outlined contribution guidelines for the project.

Author: GeekInTheNorth

CONTRIBUTING.md

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+# Contributing
+
+I am open to contributions to the code base. The following rules should be followed:
+
+1. Contributions should be made by Pull Requests targeting the `develop` branch.
+2. All commits should have a meaningful messages.
+3. All commits should have a reference to your GitHub user.
+4. Ideally all new changes should include appropriate unit test coverage.