import from github

CONTRIBUTING.md

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+# DO's and DON'T's for contributors to `tumbledemerald`:
+
+DO:
+
+- Keep `tumbledemerald` up-to-date with `@pret`'s decomp. (pret/pokeemerald)
+- Send pull requests
+- Send feature requests
+- Hang out with us on **[matrix]**
+- Follow the [style guide](STYLE.md)
+
+DON'T:
+
+- Send a pull request to ask `pret` to merge our code into the main project
+- Be uncivilised
+- Do anything that isn't in English, French, or German.
+- Spam
+- Be a phobe (homophobic, etc.) You will be removed from the equation.