Allow README.md files in each directory

currently it is not 100% clear if it is in line with the standard to add README.md files in each relevant directory. In the unixish approach it is kind of visible in the docs section but also the general docs/README.md is missing.

for me the main criteria is on what level we are curating the documentation and how deep the directory standard goes.

Is there a way to simplify the standard for small projects?

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