* lay base for 3D engine

* add failure reporting to Init functions, and DeInit functions
* GPU-related notes
* readme update

SPI.h

@@ -31,7 +31,8 @@ namespace SPI
 
 extern u16 Cnt;
 
-void Init();
+bool Init();
+void DeInit();
 void Reset();
 
 u16 ReadCnt();