[WIP] Add submodule to repository

[Copilot]

Add Git Submodule to Repository

This PR initializes the git submodule that is referenced in .gitmodules but was never initialized.

Plan:

• Explore repository structure and understand the current state
• Identify that .gitmodules exists but the submodule is not initialized
• Initialize the submodule using git submodule init
• Update/fetch the submodule content using git submodule update
• Verify the submodule is properly set up
• Commit the initialized submodule
• Final verification

Original prompt

I want to add a submodule inside this repo

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