better readme

Former-commit-id: 97c54345

CICD/tests/Readme.md

-this folder should contain tests that will be run automatically by the CICD pipeline
+This folder should contain tests that will be run automatically by the CICD pipeline.
 
-all files with fileending .sh will be executed by a shell
-all files with fileending yml will be executed by ansible-playbook
-./tmp can be used as temporary folder and will be cleaned after execution
+The trigger mechanism to execute these tests is `.gitlab-ci.yml` in the toplevel folder of this repository.
 
-because I can I am prefixing tests with 0-9 to give the execution some priority
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+ - *.sh will be executed by a shell, *.yml will be executed by ansible-playbook
+ - A test should return 0 as success or otherwise as fail. See 0_Example*
+ - Tests should aim not to alter the system except /tmp
+ - Prefixing tests with 0-9 to give the execution some priority
+ - Tests should not need elevated priviliges. A special user TODO is considered to be present
+ - TODO a way to deal with Test Payload. This will be determined on test submission
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