update README.md
Update README.md
Correct some typo error
Merge branch 'release/v1.0-alpha' of https://github.com/yunjiali/Media-Fragment-Player into release/v1.0-alpha
Add a test page
Fix a bug that the media fragment won't start playing when autoStart=false
Add setPositionLock parameter
Fix a bug that setPositionLock locks itself
Merge branch 'release/v1.0-alpha' into dev