add multi-touch support to readme
add multi-touch support to readme

yuhangwang/pv,CyrusBiotechnology/pv,CyrusBiotechnology/pv,yuhangwang/pv,yuhangwang/pv,Traksewt/pv,yuhangwang/pv,Traksewt/pv,biasmv/pv,Traksewt/pv,CyrusBiotechnology/pv,biasmv/pv,Traksewt/pv,biasmv/pv,biasmv/pv,CyrusBiotechnology/pv