Add OWNERS in external/ims

* Owners are selected from top CL approvals or owners.
  They will be suggested to review/approve future CLs.
* OWNERS files are recognized by the new find-owners plugin, see .md files in
  https://gerrit.googlesource.com/plugins/find-owners/+/master/src/main/resources/Documentation/

Test: build/make/tools/checkowners.py -c -v OWNERS
Change-Id: I3d8fb9a2329bb4806ccb03300595330a9ffc2968
1 file changed
tree: 3305b814d429e55f085f8f840dab955bb0768531
  1. OWNERS
  2. rcs/