docs: add contributing walkthrough

CONTRIBUTING.md

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+# Contributing
+
+## Making major changes
+Please first discuss the change you wish to make via issue,
+email, or any other method with the owners before making a change.
+
+Please note we have a code of conduct, follow it in all your interactions with the project.
+
+## Making minor changes
+@sinkaroid are not the best coder, so there are sure some problematic coding decision, every slightest of changes will helps a lot. I'm always happy to receive Pull requests to improve things.