Add simulator shortcut info to README
Add simulator shortcut info to README

Flipboard/FLEX,pjebs/FLEX,DaidoujiChen/FLEX,jdk89757/FLEX,lintaoSuper/FLEX,fbernardo/FLEX,hoaquo/FLEX,Flipboard/FLEX,tttpeng/FLEX,NSExceptional/FLEX,BrianBatchelder/FLEX,Xiaobin0860/FLEX,tttpeng/FLEX-DatabaseBrowser,Automatic/FLEX,evliu/FLEX,NSExceptional/FLEX,Kingside/FLEX,programming086/FLEX