Merge pull request #20 from smirko-dev/Update-documentation

Contributing documentation

CONTRIBUTING.md

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+# Contributing to fitbit-homeassistant
+
+## Do you have a questions?
+
+* Please don't file an issue if you have a question.
+* Use [Github Discussions](https://github.com/smirko-dev/fitbit-homeassistant/discussions) to drop your question in case of it's not already dicussed.
+
+## Did you find a bug?
+
+* Search [Github Issues](https://github.com/smirko-dev/fitbit-homeassistant/issues) if your issue was already addressed.
+* Create a bug report in case of you don't find a matching existing one.
+  * Use a clear and descritive title.
+  * Add the version you encountered the issue with.
+  * Add detailed steps to reproduce the issue and the observed behavior (and optionally expected behavior).
+* If you find a closed issue which seems to be the same as yours, create a new bug report and link it to yours.
+
+## Do you intend to add a new feature or change an existing one?
+
+* Create a pullrequest [Github Pull requests](https://github.com/smirko-dev/fitbit-homeassistant/pulls).
+* Add a detailed description of the changes and the reason for the change.