Merge branch 'develop' into 'master'

Add contributing. meta#66

See merge request !18

CONTRIBUTING.md

+# Contributing
+
+When contributing to this repository, please first read about [contributing to AURA](https://gitlab.servus.at/aura/meta/-/blob/master/docs/development/contributions.md). Then discuss the change you wish to make via issue, email, or any other method with the owners of this repository before making a change.
+
+Please note we have a [code of conduct](/aura/meta/-/blob/master/docs/development/code_of_conduct.md), please follow it in all your interactions with the project.
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