Merge pull request #3 from yanglicheng8/master

merge into master
Revert "merge into master"
Merge pull request #4 from yanglicheng8/revert-3-master

Revert "merge into master"
add Podfile
Update README.md
Merge remote-tracking branch 'origin/develop' into develop
Merge pull request #5 from yanglicheng8/develop

Develop