Added Contributing Guidelines.

Author: mikeroyal

Contributing.md

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+# Contributing Guidelines
+
+**Make sure your pull request follows these guidelines:**
+
+- Search through the previous pull requests before making a new one! 
+- Adding new categories, or improving existing categories is welcome!
+- Make sure you've personally used or benefited from the suggested resource.
+- Make an individual pull request for each suggestion.
+- Use the following format: `[Resource Title](url link) — description.`
+- Expand on why the resource is useful in your pull request if needed.
+- Keep descriptions short and simple, but descriptive. 
+- Please double check your spelling and grammar.
+
+**Thanks for contributing to this Project!**