Added CONTRIBUTING.md

CONTRIBUTING.md

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+# :eight_spoked_asterisk: :stars: :sparkles: :dizzy: :star2: :star2: :sparkles: :dizzy: :star2: :star2: Contributing :star: :star2: :dizzy: :sparkles:  :star: :star2: :dizzy: :sparkles: :stars: :eight_spoked_asterisk:
+
+So, you want to contribute to this project! That's awesome. However, before
+doing so, please read the following simple steps how to contribute. This will
+make the life easier and will avoid wasting time on things which are not
+requested. :sparkles:
+
+## Discuss the changes before doing them
+ - First of all, open an issue in the repository, using the [bug tracker][1],
+   describing the contribution you'd like to make, the bug you found or any
+   other ideas you have. This will help us to get you started on the right
+   foot.
+
+ - If it makes sense, add the platform and software information (e.g. operating
+   system, Node.JS version etc), screenshots (so we can see what you're seeing).
+
+ - It's recommended to wait for feedback before continuing to next steps. However,
+   if the issue is clear (e.g. a typo) and the fix is simple, you can continue
+   and fix it.
+
+## Fixing issues
+ - Fork the project in your account and create a branch with your fix:
+   `some-great-feature` or `some-issue-fix`.
+
+ - Commit your changes in that branch, writing the code following the
+   [code style][2]. If the project contains tests (generally, the `test`
+   directory), you are encouraged to add a test as well. :memo:
+
+ - If the project contains a `package.json` file add yourself in the
+   `contributors` array (if it doesn't exist, create it):
+
+   ```json
+   {
+      "contributors": [
+         "Your Name <and@email.address> (http://your.website)
+      ]
+   }
+   ```
+
+## Creating a pull request
+
+ - Open a pull request, and reference the initial issue in the pull request
+   message (e.g. *fixes #<your-issue-number*). Write a good description and
+   title, so everybody will know what is fixed/improved.
+
+ - If it makes sense, add screenshots, gifs etc, so it's easier to see what's
+   going on.
+
+## Wait for feedback
+Before accepting your contributions, we will review them. You may get feedback
+about what should be fixed in your modified code. If so, just keep committing
+in your branch and the pull request will be updated automatically.
+
+## Everyone is happy!
+Finally, your contributions will be merged, and everyone will be happy! :smile:
+
+Thanks! :sweat_smile:
+
+[1]: https://github.com/IonicaBizau/git-stats/issues
+[2]: https://github.com/IonicaBizau/code-style