Add release-note to docs

docs/release-note-3.0a.md

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+# Cocos2d-JS v3.0 alpha
+
+`Cocos2d-JS` consists of `Cocos2d-html5` and `Cocos2d-x JSBinding`. It provides a tool that makes it much simpler and more convenient to develop Html5 and JSB application. For more informations please see [Cocos2d-JS github site](https://github.com/cocos2d/cocos2d-js)
+
+## Download
+
+[Cocos2d-JS-v3.0-alpha.zip](http://cdn.cocos2d-x.org/Cocos2d-JS-v3.0-alpha.zip)
+[Online API reference](http://www.cocos2d-x.org/reference/html5-js/V3.0alpha/index.html)
+
+## Highlights
+
+* Provide a python tool which make the development of Html5 and JSB application much simpler and more convenient, [document reference](http://www.cocos2d-x.org/docs/manual/framework/html5/cocos-console/en).
+* Incredibly simplified game creation process via cc.game which replaced old cc.Application, [document reference](http://www.cocos2d-x.org/docs/manual/framework/html5/v3.0/cc-game/en).
+* Cocos2d-html5 engine core is separated into modules and can be configured via `project.json`, see [project.json guide](http://www.cocos2d-x.org/docs/manual/framework/html5/v3.0/project-json/en) and [module config doc](http://www.cocos2d-x.org/docs/manual/framework/html5/v3.0/moduleconfig-json/en).
+* Refactor some properties of all rendering classes with getter setter for providing a new set of Javascript user friendly APIs, and `attr` function is provided for cc.Node to modify multiple properties, [document reference](http://www.cocos2d-x.org/docs/manual/framework/html5/v3.0/getter-setter-api/en).
+* Add new event manager to cocos2d-html5, all events are dispatched via cc.eventManager with several types of event listener including custom event listener, [document reference](http://www.cocos2d-x.org/docs/manual/framework/html5/v3.0/eventManager/en).
+* A new all-type extendable loader is added for resource loading process, [document reference](http://www.cocos2d-x.org/docs/manual/framework/html5/v3.0/cc-loader/en).
+* Refactor foundational data structures for better maintainability, [document reference](http://www.cocos2d-x.org/docs/manual/framework/html5/v3.0/basic-data/en).
+
+### More information ###
+
+Read more about all the new features at [Cocos2d-JS v3.0 alpha changelog](http://www.cocos2d-x.org/docs/manual/framework/html5/release-notes/v3.0a/changelog/en) and [Cocos2d-JS v3.0 alpha upgrade guide](http://www.cocos2d-x.org/docs/manual/framework/html5/release-notes/v3.0a/upgrade-guide/en)