fp: Add notes on art

readme.md

@@ -63,3 +63,14 @@ for that directory, e.g.
 cd Build\Terry_Cherry_Emscripten
 python -m http.server
 ```
+
+## Asset Packaging
+
+Assets are stored in the `Data` folder. In particular, textures are stored as
+individual sprites and combined using a utility program to pack them into
+a sprite sheet with their positions annotated into a specification file that is
+loaded at runtime.
+
+Textures are specified in the `sprite_spec.txt` file and given to the sprite
+packer tool from this repository. The sprite packer will generate a the sprite
+sheet.