Create CONTRIBUTING.md

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.github/CONTRIBUTING.md

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+# Contributing Guidelines
+
+👍🎉 First off, thanks for taking the time to contribute! 🎉👍
+
+Here you will find a set of guidelines for contributing to TRaSH Guides, Which you can find [HERE](https://trash-guides.info/),
+These are mostly guidelines, not rules. Use your best judgment, and feel free to propose changes to this document in a pull request.
+
+## Guidelines
+
+- Make sure you're editing the latest version.
+- If you propose changes make sure it doens't break anything else in the Guides.
+- Make sure that after the changes you don't get any [markdownlint](https://github.com/markdownlint/markdownlint/blob/master/docs/RULES.md) errors
+
+## Recommendations
+
+- use [VSCode](https://code.visualstudio.com/) for editing it makes sure the ident is correct and also shows [markdownlint](https://github.com/markdownlint/markdownlint/blob/master/docs/RULES.md) errors