Create contributing.md

Author: phodal

contributing.md

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+# Contribution Guidelines
+
+Please ensure your pull request adheres to the following guidelines:
+
+- Read [the awesome manifesto](https://github.com/sindresorhus/awesome/blob/master/awesome.md) and ensure your list complies.
+- Search previous suggestions before making a new one, as yours may be a duplicate.
+- Make sure your list is useful before submitting. That implies it having enough content and every item a good succinct description.
+- A link back to this list from yours, so users can discover more lists, would be appreciated.
+- Make an individual pull request for each suggestion.
+- Titles should be [capitalized](http://grammar.yourdictionary.com/capitalization/rules-for-capitalization-in-titles.html).
+- Use the following format: `[List Name](link)`
+- If you have a comment about the link, add it after a dash, start it with a capital letter, and end it with a full stop. Avoid starting your comment with an article like "A", "The".
+- Link additions should be added to the bottom of the relevant category.
+- New categories or improvements to the existing categorization are welcome.
+- Check your spelling and grammar.
+- Make sure your text editor is set to remove trailing whitespace.
+- The pull request and commit should have a useful title.
+
+Link format:
+
+```
+[Awesome resource name](resource link) - Performant REST client library by the famous John Doe.
+                                       ^ ^                                                    ^
+                                    dash capital letter, no article                           Full stop
+```
+
+Thank you for your suggestions!