Fonts!

* Add MousePaint fonts

MGTK.md

@@ -89,6 +89,8 @@ Point       vertex0
 ```
 
 ### Font
+This is a MousePaint-compatible font. Single- and double-width fonts are
+supported; max height is 16 pixels.
 ```
 .byte       fonttype        0=regular, $80=double-width
 .byte       lastchar        char code of last character (usually $7F)

fonts/README.md

@@ -0,0 +1,12 @@
+# MouseGraphics Fonts
+
+This is a collection of fonts that work with MGTK.
+
+Font Name | Origin | # Glyphs | Width | Height
+--------- | ------ | -------- | ----- | ------
+A2D.FONT | Apple II Desktop | 128 | Single | 9
+MP.FONT | MousePaint | 128 | Single | 9
+ATHENS | MousePaint | 128 | Double | 12
+NEW.YORK | MousePaint | 128 | Double | 11
+TORONTO | MousePaint | 128 | Double | 11
+VENICE | MousePaint | 128 | Double | 10