Makefile: add 'run' make target

This builds and runs the container, then the application. Then stops and
removes the container when the application is finished. This should avoid
any lingering remains of exited containers, or attempting to run a
container that is already running.

Signed-off-by: Paul Campbell <pcampbell@kemitix.net>
README.md: Primary development is complete

The image should now be usable for most Android Studio purposes.

Signed-off-by: Paul Campbell <pcampbell@kemitix.net>