Add CONTRIBUTING.md

CONTRIBUTING.md

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+# Contributing
+
+Please do the following:
+
+- Follow general best practices
+- Follow best practices for contributing to other peoples' code
+- Follow best practices for programming
+- Follow best practices for Hugo
+- Follow best practices for Git
+- Follow best practices for GitHub
+- Use [atomic commits](https://en.wikipedia.org/wiki/Atomic_commit#Atomic_commit_convention)
+- Use [sentence case](https://en.wiktionary.org/wiki/sentence_case) for commit subjects