Create CONTRIBUTING.md with contributor guidelines

Add contributing guidelines for project contributors.

Author: TheRandomDevBro

CONTRIBUTING.md

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+Thanks for (maybe) signing up to be a contributor of this project!
+
+Make sure to add features that the community want. If a feature sounds bad and not helpful, you can kindly decline it.
+For moderating, make sure that everything being posted agrees to our rules and the Scratch TOS and Community Guidelines.
+
+Thats all that you need. But ya may need:
+- Responsiblity
+- Critical Thinking
+
+And remember to HAVE FUN!