Added activity indicator

Signed-off-by: AravinthChandran <arvinthchandran@gmail.com>
Merge branch 'master' of github.com:AravinthChandran/ReviewViewer

# By kirthika05 (2) and AravinthChandran (1)
# Via AravinthChandran (2) and kirthika05 (1)
* 'master' of github.com:AravinthChandran/ReviewViewer:
  Updated readme
  Update README.md
  Create README.md