Merge pull request cocos2d#2 from flyingpacer/master

add changelog and readme

ChangeLog

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+cocos2d-x for xna 1.0.0 Feb.17 2012
+* This is the 3d-alpha version of cocos2d-x for xna.
+* And the primary features of the engine have been realized.
+
+Primary Features
+------------------
+	director:manages how and when to execute the Scenes
+	node:the main element, anything thats gets drawn or contains things that get drawn is a CCNode
+	layer:inherites from node and implements the TouchEventsDelegate protocol 
+	scene:organizes the nodes and then run, actually shown, by the director 
+	sprite:a kind of node binding a 2d image with corresponding features
+	menu:responses to the clicks 
+	labelttf:be used to render text labels
+	particle system:nearly thirty particle examples are shown in tests, supports plist
+	tilemap:a kind of map that is composed of many texture tiles
+	cocosdenshion:offer the interfaces to play background music and sound effect

readme.mdown

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+cocos2d-x for xna
+==================
+
+cocos2d-x for xna is a 2D game engine in C#, based on [cocos2d-x][1] and licensed under MIT.
+The engine is jointly developed by [cocos2d-x][1] and [OpenXLive][2].
+
+Document
+------------------
+   * Website: www.cocos2d-x.org
+              www.openxlive.com
+   * [Online API References][3] 
+
+Contact us
+------------------
+   * Forum: http://www.cocos2d-x.org/projects/cocos2d-x/boards/17
+
+Thanks to the core-developers
+------------------
+		ronghong.huang(flyingpacer)
+		xiaoming.zhang(minggo)   
+		chunlin.qin(elvis)
+		yang.you(youyang)
+		kaiwei.liu(lkw)
+
+[1]: http://www.cocos2d-x.org "cocos2d-x"
+[2]: http://www.openxlive.com "OpenXLive"
+[3]: http://www.cocos2d-x.org/embedded/cocos2d-x/classes.html "API References"