chore: update README.md

README.md

@@ -1,4 +1,29 @@
-# Almost-Empty Demo Collection
+# An Almost-empty GBA Test Collection
+NOTE: This only builds on stage1 due to unimplemented language features that ZigGBA relies on. 
 
 ### `2d_sprites.gba`
-`grit` command: `grit sprite.bmp -ftc -pu32 -pn16 -gB4`
+At some point during my initial PPU Implementation, I had problems with 
+2D-mapped vertical sprites. This is a ROM based on TONC's `sprite_demo.gba` That displays every kind of 2D-mapped sprite. 
+
+This ROM will display:
+* 4BPP 
+    * Square: 8x8, 16x16, 32x32, 64x64
+    * Horizontal: 16x8, 32x8, 32x16, 64x32
+    * Vertical: 8x16, 8x32, 16x32, 32x64
+* 8BPP
+    * Square: 8x8, 16x16, 32x32, 64x64
+    * Horizontal: 16x8, 32x8, 32x16, 64x32
+    * Vertical: 8x16, 8x32, 16x32, 32x64
+
+Keep in mind that all displayed sprites are 2D-mapped. 
+
+TODO: Do the same but for 1D mapped sprites. <br />
+TODO: Figure out how to communicate current configurations to the user.
+
+#### Controls 
+Button | Action
+--- | ---
+Start | Toggle Between 8bpp and 4bpp
+L, R | Change the Size of the Sprite (Dimentions within the context of a Shape)
+A, B | Change the Shape of the Sprite (Square, Horizontal, Vertical)
+D-Pad | Move Sprite