Update README.md

More info.

README.md

@@ -68,4 +68,6 @@ Supported platforms (including but not limited to) are:
   * High-level functions: `begin_screen()`, `end_screen()`. These take care of color restoration, clearing screen, hiding the cursor etc, except for the resizing of the terminal window.
   * `draw_frame()` : Draws a simple frame around your frame buffer.
   * `draw_game_over()`, `draw_you_won()` : Draws wavy banners in the FIGlet font Grafitti. Used by `GameEngine` if those features are enabled.
-
+* `Text` : Handles text output and translates Color enum items to corresponding color values depending on platform compiled. Is also responsible for creating the appropriate ANDI escape sequences for the TTY and such.
+* `ScreenHandler` : Contains the screen buffers (char / fg-color / bg-color) and manages transparency etc. It outputs the contents to the terminal via a privatly owned `Text` object.
+* `SpriteHandler` : Manages bitmap sprites (`BitmapSprite`) and vector sprites (`VectorSprite`). A sprite can be controlled programmatically or be attached to a `RigidBody` object. Both sprite classes support sprite animations.