Add documentation to README.md describing the EFI protocols used by GBL

Include the required, conditionally required, and optional protocols
in addition to a brief description of what the protocol does and how
it is used within GBL.

Bug: b/340322551

Change-Id: Id4909170643fe704e540455d6c7e8858175882f3
5 files changed
tree: 37d01c4f18b55b4e6e742a5744748b7341380f15
  1. gbl/
  2. libxbc/
  3. vts/
  4. .gitignore
  5. BUILD
  6. LICENSE
  7. OWNERS