ANRdaemon: add README and a bash script to easily get trace.
am: 9e90477a67

* commit '9e90477a678b5b5fa6ac6dd7e78770746d6c50bf':
  ANRdaemon: add README and a bash script to easily get trace.

Change-Id: Ief3f17421cc970a6b8676921b414d093c43ea880