Create CONTRIBUTING.md

CONTRIBUTING.md

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+Contribution Policy forMMM-MotionControl
+====================================
+
+Thanks for contributing to MMM-MotionControl.
+
+We hold our code to standard, and these standards are documented below.
+
+### Clean Code
+
+Please only submit clean code with correct formatting and good Variable Names.
+
+### Submitting Issues
+
+Please only submit reproducible issues.
+
+When submitting a new issue, please supply the following information:
+
+**Platform**: Place your platform here... give us your web browser/Electron version *and* your hardware (Raspberry Pi 2/3, Windows, Mac, Linux, System V UNIX).
+
+**Node Version**: Version of your Node.
+
+**Module Version**: Version of MMM-MotionControl.
+
+**Description**: Provide a detailed description about the issue and include specific details to help us understand the problem. Adding screenshots will help describing the problem.
+
+**Steps to Reproduce**: List the step by step process to reproduce the issue.
+
+**Expected Results**: Describe what you expected to see.
+
+**Actual Results**: Describe what you actually saw.
+
+**Configuration**: What does the used config.js file look like? Don't forget to remove any sensitive information!
+
+**Additional Notes**: Provide any other relevant notes not previously mentioned. This is optional.