Create CONTRIBUTING.md

CONTRIBUTING.md

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+# Contribution Guidelines
+Please ensure your pull request adheres to the following guidelines:
+
+* Please search previous suggestions before making a new one, as yours may be a duplicate.
+* Code, comments and documentation need to be in English.
+* If possible, please publish your library under an open source license (preferably MIT).
+* Please make an individual pull request for each suggestion.
+* New categories, or improvements to the existing categorisation are welcome.
+* Keep descriptions short and simple.
+* End all descriptions with a full stop/period.
+* Check your spelling and grammar.
+* Make sure your text editor is set to remove trailing whitespace.
+* Proposed libraries should ideally have 10+ stars.
+* Please keep the lists in alphabetical order.
+
+Thank you for your suggestions!