Add intro paragraph to demo

demo.css

 :root
 {
     --canvas-background-style: hsl(271, 61%, 74%);
-    --debug-border-style: 2px dashed hsl(247, 93%, 69%);
+    --debug-border-style: 3px dashed hsl(247, 93%, 69%);
     --debug-background-style: hsla(221, 77%, 39%, 0.4);
     
     --debug-value-background-style: hsl(355, 54%, 52%);
@@ -31,6 +31,7 @@ body
 {
     position: absolute;
     top: 0; right: 0;
+    max-width: 33%;
     
     padding: 1em;
     

demo.html

@@ -10,6 +10,8 @@
 		<p id="message-es6-modules">Sorry, your browser doesn't support es6 modules. Try upgrading your browser or enabling support in about:config or chrome://flags.</p>
 		
 		<div class="debug-data">
+			<h3>Line Simplifier</h3>
+			<p>An implementation of Valvalingam's line simplification algorithm in both Javascript and C&sharp;. Code available under the Mozilla Public License 2.0 <a href="https://github.com/sbrl/line-simplification">on GitHub</a>.</p>
 			<ul>
 				<li>Points: <output id="output-point-count"></output> &#10142; <output id="output-simple-point-count"></output></li>
 				<li>Min Area: <input type="range" id="input-epsilon" value="2" min="0" max="100" step="0.05" /> <output id="output-epsilon"></output></li>