Update README.md

Author: furrtek

README.md

@@ -1,6 +1,8 @@
-TODO: Test CD sprites encode/decode
-TODO: Cart sprites encode/decode
+* TODO: Test CD sprites encode/decode
+* TODO: Cart sprites encode/decode
 
+```
 Usage: gfxcodec (-d|e) (-f|s|c) (input file) (output file)
 -d|e: decode/encode
 -f|s|c: fix/cart sprites/CD sprites"
+```