Create CONTRIBUTING.md

CONTRIBUTING.md

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+# How to contribute
+Thanks for taking your time to read this. We're thrilled you're reading this because we the help from the community to keep improving this project.
+
+## Testing
+We have a handful of Cucumber features, but most of our testbed consists of RSpec examples. Please write RSpec examples for new code you create.
+
+## Submitting changes
+Please send a [GitHub Pull Request](https://github.com/Hacker0x01/react-datepicker/pull/new/master) with a clear list of what you've done (read more about [pull requests](http://help.github.com/pull-requests/)). When you send a pull request, we will love you forever if you include a test to cover your changed. We can always use more test coverage. 
+Always write a clear log message for your commits. One-line messages are fine for small changes, but bigger changes should look like this:
+    $ git commit -m "A summary of the commit
+    > 
+    > A paragraph describing what changed and its impact."
+
+## Coding conventions
+Start reading our code, and you'll get the hang of it. We optimize for readability:
+  * We use prettier for code styling. Don't worry about tabs vs spaces, or how to indent your code.
+  * We use ESlint for all other coding standards. We try to be consistent and helpful.
+  * This is open source software. Consider the people who will read your code, and make it look nice for them. It's sort of like driving a car: Perhaps you love doing donuts when you're alone, but with passengers, the goal is to make the ride as smooth as possible.