Move STS SDK readme into STS SDK directory. am: 731d4ed23e am: c9bf4dca6c am: 8ae64b0ecc am: 0632e74f89

Original change: https://googleplex-android-review.googlesource.com/c/platform/platform_testing/+/20484848

Change-Id: I5f4dbfe1ed1878008986908dbba9585a4d4d9333
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>
tree: ce663ac742cc5da4640b28ce5aedb2de7ed26310
  1. build/
  2. docs/
  3. emu_test/
  4. libraries/
  5. scripts/
  6. tests/
  7. utils/
  8. PREUPLOAD.cfg