Add some docs on how to use this

Change-Id: I138a981ed7bd714bb1dcab19e61f142c77c58410
1 file changed
tree: 5c51f24be3a4556cfea80c7e301fa589bb7dbed3
  1. Config.in
  2. board/
  3. configs/
  4. external.desc
  5. external.mk
  6. index.md
  7. package/