Added a few comments where to find the DevOps settings.

Signed-off-by: Christian Wolf <github@christianwolf.email>

DEVELOPMENT.md

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+# Development of the cookbook app
+
+We are happily accepting code contributions of different types. Here are some hints on this.
+
+## Development environment
+
+For now, there is no included documentation on how to setup your environment best.
+
+You might however have alook at [this repository](https://github.com/christianlupus/nextcloud-docker-debug).
+It describes **one** way to get a running development environment for the app.
+
+## Unit tests and code coverage
+
+Currently there is a github action in place that does automatic unit testing upon pushing to github.
+These tests are generating code coverage reports as well.
+
+Firstly, for each such run (see in the actions view or the PR tests) there is the option to download the code coverage as zipped HTML page.
+Secondly, the [codecov.io service](https://codecov.io/gh/nextcloud/cookbook) is installed, where more details about the coverage can be found.