ARC 1.2.0 - Release Documentation

Feature Docuementation to be modified. Please refer to this page for the content: https://mosip.atlassian.net/wiki/spaces/~712020a354eedce17e400cb961a8a3f716ad4f/pages/2681536549/Feature+Documentation+-+ARC

Release notes to be created. Please refer to this page for content: https://mosip.atlassian.net/wiki/spaces/ENGG/pages/2683240454/Android+Registration+Client+v1.2.0