lead in example

Author: justvanrossum

README.md

@@ -60,7 +60,7 @@ class, and a set of backend classes. Each backend provides a Canvas class.
 You pass a Canvas instance to a BlackRendererFont instance when drawing a
 glyph. Most backends also have a Surface class, which is a generalized
 convenience class to produce a canvas for a bitmap (or SVG document) for a
-specific box.
+specific box. Here is a minimal example:
 
 ```python
 from blackrenderer.font import BlackRendererFont