v0.1: Just make the ROM , RAM & CART A 

v0.2 : making video card

v0.3.0 : making better video card (incomplete)

v0.3.1 : finish PPU v2 (not program yet)

v0.3.2 : redesign PPU v2 for faster speed (incomplete)

v0.3.3 : add clock module for PPU v2

v0.3.4 : finish PPU v2 (not program yet)

v0.3.5 : finish Programing PPU v2 & Run some basic picture