adds screenshot

Author: hartym

img/example.png

@@ -112,6 +112,11 @@ <h2>Quick start</h2>
     ...</code></pre>
 
         <p>That's all, folks!</p>
+
+        <div class="text-center">
+            <img src="img/example.png" alt="Mondrian, python's logging on steroids."
+                 class="img-responsive">
+        </div>
     </div>
 
     <hr>