lib: Rename readme.md to README.md
This PR renames readme.md to README.md for easier find-ability. (I know I made a typo on the commit message, I can amend it before we merge)
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
This PR renames readme.md to README.md for easier find-ability. (I know I made a typo on the commit message, I can amend it before we merge)