Added contribution rules

CONTRIBUTING.md

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+# Contribution Guidelines
+
+Please ensure your pull request adheres to the following guidelines:
+
+- Search previous suggestions before making a new one, as yours may be a duplicate.
+- Suggested packages should be tested and documented.
+- Use the following format: `[BUNDLE NAME](LINK) - DESCRIPTION.`
+- New categories, or improvements to the existing categorization are welcome.
+- Keep descriptions short and simple, but descriptive.
+- End all descriptions with a full stop/period.
+- Check your spelling and grammar.
+- Make sure your text editor is set to remove trailing whitespace.
+
+Thank you for your suggestions!