Improved readme
Improved readme

Added Quickstart guide and dependency list
Dagers/React-Native-Differential-Updater,Dagers/React-Native-Differential-Updater,Dagers/React-Native-Differential-Updater,Dagers/React-Native-Differential-Updater,Dagers/React-Native-Differential-Updater,Dagers/React-Native-Differential-Updater