docs:

  Introduction: Brief.md
  Guide:
    Developer's Guide: Guide_Developer.md
    Integrate GCanvas on Weex: Guide_Setup_Weex.md
    Integrate GCanvas on ReactNative: Guide_Setup_ReactNative.md
    Custom Bridge: Guide_Custom_Bridge.md
    Contribute to GCanvas: Contributing.md
  Design:
    Architecture: An_Introduction_to_GCanvas.md
  Reference:
    Graphics 2D: Reference_Graphics_2D.md
    WebGL: Reference_WebGL.md
  About: About.md