1. Add the introduction of rating modules. 2. Add operating example about enable/disable and set priority for rating modules. Change-Id: I3ac6786e78fcb3246dac5f8286128101a6f88656
1. Add the introduction of rating modules. 2. Add operating example about enable/disable and set priority for rating modules. Change-Id: I3ac6786e78fcb3246dac5f8286128101a6f88656