Create CONTRIBUTING.md

Author: OmgRod

CONTRIBUTING.md

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+# Contributing
+
+We only accept pull requests that meet one of the following criteria:
+
+1. Fix an existing issue
+2. Implement an approved feature request
+3. Resolve a critical bug (e.g. security vulnerability or breaking issue)
+
+Please ensure your pull request includes a clear description of the problem and the solution.