Create CONTRIBUTING.md

Author: DavesCodeMusings

CONTRIBUTING.md

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+# Contributing
+Also know as how can you help?
+
+## Testing
+The vast majority of BTHome properties have been incorporated into the module. But in my projects, I only use a handful of them. Which means many are untested under real-world conditions. If you're using BTHome-MicroPython in a project and something's not quite right, please fill out a bug report in the [GitLab issues](https://github.com/DavesCodeMusings/BTHome-MicroPython/issues).
+
+## Bug Reports
+Try to include the following:
+* What's not working?
+* What is it doing?
+* What should it be doing?
+* Any ideas to fix it.
+
+For example:
+
+Gas detection is not working. It's returning a 16-bit integer. It should be returning a boolean. I looked in bthome.py and I think the property is mapped incorrectly.