Add a top-level Android.bp with the license information and an
Android.bp for the pw_rpc Java client.
Change-Id: I8e4e5959d5a96210296e3587154afac5e50dcca6
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/74400
Reviewed-by: Keir Mierle <keir@google.com>
Reviewed-by: Anthony Stange <stange@google.com>
Commit-Queue: Wyatt Hepler <hepler@google.com>
Pigweed-Auto-Submit: Wyatt Hepler <hepler@google.com>
