Create CONTRIBUTING.md

Author: Universemul

CONTRIBUTING.md

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+Whether reporting bugs, discussing improvements and new ideas or writing extensions: Contributions to FlashDB are welcome! Here's how to get started:
+
+1. Check for open issues or open a fresh issue to start a discussion around a feature idea or a bug
+2. Fork the repository on Github, create a new branch off the master branch and start making your changes (known as GitHub Flow)
+3. Write a test which shows that the bug was fixed or that the feature works as expected
+4. Send a pull request and bug the maintainer until it gets merged and published ☺
+5. Please respect the template of a Pull Request