* [doc] add how-to-debug.md
* [doc] add how-to-debug.md

zhangquan/weex,xiayun200825/weex,dianwodaMobile/DWeex,lzyzsd/weex,LeeJay0226/weex,HomHomLin/weex,alibaba/weex,HomHomLin/weex,boboning/weex,cxfeng1/incubator-weex,LeeJay0226/weex,xiayun200825/weex,alibaba/weex,cxfeng1/weex,kfeagle/weex,MrRaindrop/weex,Hanks10100/incubator-weex,leoward/incubator-weex,KalicyZhou/incubator-weex,MrRaindrop/weex,yuguitao/incubator-weex,xiayun200825/weex,namedlock/weex,acton393/incubator-weex,acton393/incubator-weex,miomin/incubator-weex,KalicyZhou/incubator-weex,MrRaindrop/weex,Hanks10100/incubator-weex,KalicyZhou/incubator-weex,yuguitao/incubator-weex,houfeng0923/weex,bigconvience/weex,Tancy/weex,alibaba/weex,kfeagle/weex,lzyzsd/weex,yuguitao/incubator-weex,MrRaindrop/weex,Hanks10100/weex,Tancy/weex,houfeng0923/weex,misakuo/incubator-weex,zhangquan/weex,acton393/weex,Hanks10100/incubator-weex,Tancy/weex,yuguitao/incubator-weex,Tancy/weex,leoward/incubator-weex,zzyhappyzzy/weex,zhangquan/weex,Neeeo/incubator-weex,boboning/weex,cxfeng1/weex,zzyhappyzzy/weex,weexteam/incubator-weex,yuguitao/incubator-weex,Neeeo/incubator-weex,Hanks10100/incubator-weex,bigconvience/weex,Neeeo/incubator-weex,Neeeo/incubator-weex,cxfeng1/weex,Hanks10100/weex,Hanks10100/incubator-weex,kfeagle/weex,kfeagle/weex,lzyzsd/weex,lzyzsd/weex,acton393/incubator-weex,MrRaindrop/weex,LeeJay0226/weex,zzyhappyzzy/weex,acton393/weex,MrRaindrop/incubator-weex,weexteam/incubator-weex,acton393/weex,acton393/incubator-weex,zzyhappyzzy/weex,cxfeng1/incubator-weex,cxfeng1/incubator-weex,cxfeng1/weex,alibaba/weex,Tancy/weex,acton393/incubator-weex,dianwodaMobile/DWeex,cxfeng1/weex,weexteam/incubator-weex,HomHomLin/weex,miomin/incubator-weex,lvscar/weex,miomin/incubator-weex,namedlock/weex,alibaba/weex,xiayun200825/weex,MrRaindrop/incubator-weex,boboning/weex,MrRaindrop/incubator-weex,HomHomLin/weex,Neeeo/incubator-weex,leoward/incubator-weex,lvscar/weex,xiayun200825/weex,KalicyZhou/incubator-weex,LeeJay0226/weex,acton393/weex,zhangquan/weex,LeeJay0226/weex,bigconvience/weex,boboning/weex,MrRaindrop/incubator-weex,zzyhappyzzy/weex,houfeng0923/weex,zzyhappyzzy/weex,erha19/incubator-weex,namedlock/weex,LeeJay0226/weex,KalicyZhou/incubator-weex,misakuo/incubator-weex,boboning/weex,bigconvience/weex,leoward/incubator-weex,erha19/incubator-weex,weexteam/incubator-weex,namedlock/weex,misakuo/incubator-weex,MrRaindrop/weex,Hanks10100/weex,dianwodaMobile/DWeex,lvscar/weex,houfeng0923/weex,miomin/incubator-weex,acton393/incubator-weex,weexteam/incubator-weex,namedlock/weex,boboning/weex,miomin/incubator-weex,lvscar/weex,namedlock/weex,MrRaindrop/incubator-weex,HomHomLin/weex,KalicyZhou/incubator-weex,dianwodaMobile/DWeex,acton393/incubator-weex,cxfeng1/incubator-weex,Tancy/weex,weexteam/incubator-weex,erha19/incubator-weex,erha19/incubator-weex,misakuo/incubator-weex,lvscar/weex,yuguitao/incubator-weex,lzyzsd/weex,cxfeng1/weex,miomin/incubator-weex,HomHomLin/weex,kfeagle/weex,Hanks10100/incubator-weex,Hanks10100/weex,misakuo/incubator-weex,erha19/incubator-weex,leoward/incubator-weex,lvscar/weex,alibaba/weex,cxfeng1/incubator-weex,zhangquan/weex,erha19/incubator-weex,Hanks10100/weex,Hanks10100/incubator-weex,lzyzsd/weex,erha19/incubator-weex,miomin/incubator-weex,dianwodaMobile/DWeex,houfeng0923/weex,cxfeng1/incubator-weex,Hanks10100/weex,Hanks10100/incubator-weex,acton393/incubator-weex,MrRaindrop/incubator-weex,zhangquan/weex,erha19/incubator-weex,bigconvience/weex,xiayun200825/weex,bigconvience/weex,alibaba/weex,Neeeo/incubator-weex,houfeng0923/weex,misakuo/incubator-weex,miomin/incubator-weex,dianwodaMobile/DWeex,acton393/weex,acton393/weex,leoward/incubator-weex,kfeagle/weex