Resolve #3483512 "Documentation update bluecheese"

Closes #3483512

To test:

Review the READme.md doc

Does it seem clear for new contributors?

Is there anything missing?

Is there anything the can be cut or edited?

Compoare it to our Google doc: https://docs.google.com/document/d/1vjIfqghxzo5Z_j1lhvKD2JQrljla8R5RrutQxalQwCs/edit?tab=t.0#heading=h.8inv4sh1oc1v

Is there anything included in one that should be included in the other?Should we deprecate the Google doc in favor of this readme?

Is there anything that would make sense in the parent repo instead?