Update README

This app allows to create new user or authenticate the existing user with the cloud database using parse sdk. 
The user can take a new picture, choose pictures from gallery and draw on top of the image using finger touch. 
The draw options can be navigated using default menu button. 
User can then upload the image on server which he/she can view in his/her timeline. 
Upon clicking the image he/she can view the entire image.
Functionalites:
Lazy load, caching of images, pull to refresh limit of 30 images