Contributing: New entry.

CONTRIBUTING.md

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+## Contributing
+
+Guide below will explain the process of submitting a pull request (PR).
+
+1. Fork it.
+
+1. Clone your forked project:
+
+   ```
+   git clone http://github.com/<your_github_username>/traktarr
+   ```
+
+1. Create a feature branch off of the **develop** branch:
+
+   ```
+   git checkout -b 'feature/my-new-feature' develop
+   ```
+
+1. Keep up to date with latest **develop** branch changes:
+
+   ```
+   git pull --rebase upstream develop
+   ```
+
+1. Commit your changes:
+
+   ```
+   git commit -am 'Added some feature'
+   ```
+
+1. Push commits to the feature branch:
+
+   ```
+   git push origin feature/my-new-feature
+   ```
+
+1. Submit feature branch as a PR to _our_ **develop** branch.