feat: add rockspec to avoid needs of extra plugins on Lazy >= v11

[kevinm6]

since Lazy v11.x, Lazy supports rockspec, so extra plugins like vhyrro/luarocks.nvim are no more required.

This PR add the updated README for Lazy version >= 11.x and the rockspec file required by Lazy to install the relative luarocks.

This file should be easy to update via GHActions as another action is performed to create the same for luarocks.

[3rd]

Thank you so much!
Been having issues with the action, it only works if I trigger it manually for some reason, did you encounter that as well?

[kevinm6]

Thank you for this plugin!
Yes, I’ve noticed a "revision and manual trigger” required for the actions, maybe since is a common filename with the GHAction linked that pushes to luarocks, otherwise I don’t know.