Create CONTRIBUTING.md

Author: moul

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.
+- Make an individual pull request for each suggestion.
+- Use the following format: `[package](link) - Description.`
+- Additions should be added to the bottom of the relevant category.
+- New categories, or improvements to the existing categorization are welcome.
+- Link to the GitHub repo, not official website, npm, pypi.
+- 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.
+
+Thank you for your suggestions!
+
+### Updating your PR
+
+A lot of times, making a PR adhere to the standards above can be difficult.
+If the maintainers notice anything that we'd like changed, we'll ask you to edit your PR before we merge it.
+If you're not sure how to do that, [here is a guide](https://github.com/RichardLitt/docs/blob/master/amending-a-commit-guide.md) on the different ways you can update your PR so that we can merge it.