update_readmes.py listing dirs without readme.mds

[Wesley-Blake]

Is your feature request related to a problem? Please describe.
The update_readmes.py file should also probably list out dirs without a readme.md file.

Describe the solution you'd like
Exactly that, list out all dirs without README.md.

Describe alternatives you've considered
I could write a script to do it, or have a file to do it in the repository.

Additional context
Add any other context or screenshots about the feature request here.

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[Wesley-Blake]

I would like to do this one.

Would you like it as a separate file or as a function in Update_readmes.py?