Add documentation for the crd benchmark and execution

This MR adds documentation for the custom resource definitions benchmark and execution

Finishes part of #237 (closed)

added modul/docs label

changed the description

changed the description

mentioned in issue #237 (closed)

assigned to @she

The generated markdown requires some fine-tuning is discussed, but I will merge this for now to have the OpenAPI schema. #237 (closed) will be kept open for tracking further process on this.

approved this merge request

mentioned in commit 7f4630ce

merged