add audio-and-effect to v3
Merge branch 'master' of https://github.com/chukong/cocos-docs
add 骨骼动画详解－cocostudio
Merge pull request #389 from gloryming/master

add 骨骼动画详解－cocostudio
Merge pull request #390 from sincntx/master

Translate english to korean
Create ko.md