Create CONTRIBUTING.md

CONTRIBUTING.md

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+Contributing
+================================================================================
+
+If you want to contribute to [xfrps](https://github.com/kuntengrom/xfrps), please follow these simple rules:
+
+1. Press the fork button:
+
+    ![fork](http://oi58.tinypic.com/jj2trm.jpg)
+
+2. Clone the repository from your account with:
+
+    ```
+    git clone git@github.com:your_github_username/xfrps.git
+    ```
+
+3. Create a new branch with:
+
+    ```
+    git checkout -b "xfrps-1-fix"
+    ```
+    You can name it however you want.
+
+4. Make your changes
+
+5. Don't forget to add yourself in `contributors.md`.
+
+6. Commit and push your changes, then make a pull request from Github.
+
+    git commit --signoff  
+    git push -f
+    
+7. Awaiting review, if accepted, merged!
+
+
+
+**IMPORTANT**
+
+Please, don't forget to update your fork. While you made your changes, the content of the `master` branch can change because other pull requests were merged and it can create conflicts. This is why you have to rebase on `master` every time before pushing your changes and check that your branch doesn't have any conflicts with `master`.
+
+Thank you.