Create CONTRIBUTING.md

Author: ahmadnassri

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.
+- Make sure your contribution is useful before submitting.
+- Make an individual pull request for each suggestion.
+- Use the following format: `[name](link) - Address.`
+- Additions should be added in alphabetical order of the relevant category.
+- New categories, or improvements to the existing categorization are welcome.
+- Keep descriptions short and simple, but descriptive.
+- Start the description with a capital and end with a full stop/period.
+- Check your spelling and grammar.
+- Make sure your text editor is set to remove trailing whitespace.
+- The pull request should have a useful title and include a link to the package and why it should be included.
+
+---
+
+**Working on your first Pull Request?** You can learn how from this free series [How to Contribute to an Open Source Project on GitHub](https://egghead.io/series/how-to-contribute-to-an-open-source-project-on-github).
+
+Thank you for your suggestion!