Add example

Author: fpena2

README.md

@@ -4,13 +4,16 @@ Library for generating semi-random avatars.
 
 Inspired by Github's default avatars.
 
-
-## Usage:
+## Usage
 
 ```rust
 fn main() {
     let seed = 12345;
     let icon = Icon::new(seed);
     icon.save("test.png").unwrap();
 }
-```
+```
+
+## Example
+
+![example](/static/example.png)