Create README files for all existing module/template contributors, as well as any new partners

[f0ssel]

This should be fairly straightforward. I can't imagine the main work taking more than a day – the main thing that might slow things down is coordinating with other departments about which partners we want to add to the repo for its launch.

To be clear, we'll want to create a subdirectory + README for each existing user, as defined in #530. We'll then want to do the same for each official business partner, even if they don't have any modules/templates available.

[f0ssel]

@Parkreiner said he's tackling this already so gonna let him close when those new profiles are merged