Create CONTRIBUTING.md

CONTRIBUTING.md

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+# True Git Code Churn Contribution Guide
+We want to make contributing to this repo as easy and transparent as possible.
+
+So here we go, short and sweet:
+
+1. We welcome any type of contribution(s), but any contribution(s) you make will be under the MIT software license!
+
+2. We use [Github Flow](https://docs.github.com/en/get-started/quickstart/github-flow). If you are not familiar with this concept, then read it through before proceeding.
+
+3. When submitting ideas (under issues) or code changes, please consider backwards compatibility as much as possible. For example, scope a new feature as an optional argument so it does not break existing workflows for end users post upgrade.
+
+4. Try to only include a package only when you really feel that it is absolutely necessary. True Git Code Churn is and will always intend to be very lightweight.
+
+5. Consider the Git version and Python version when testing, it must work with Python version 3.5.3 and Git version 2.20.1 onwards.
+
+6. When submitting a bug, try to include (1) a quick summary and/or background, (2) steps to reproduce, (3) sample code if necessary, (4) expectation(s), (5) actual finding(s), and finally (6) additional notes.