Update README with additional instructions am: 7fc3494f6a am: 784267f9ed am: 187eb9d449 am: dfdcf0f9fc

Original change: https://android-review.googlesource.com/c/platform/build/pesto/+/1701745

Change-Id: I4838d23f0d92a3db9b89393781cf84fa399ba09b
tree: 2ae08a33bf0b0ba28b3a33a9315795a8689b0499
  1. experiments/
  2. OWNERS