Add example CSS file matching Sundell’s Colors

This change adds an example CSS file to a new /Examples folder, which
shows what kind of CSS classes that Splash uses when generating HTML.

Examples/sundellsColors.css

@@ -0,0 +1,59 @@
+/**
+ *  Example CSS file that can be used to style Splash HTML output
+ *  Copyright (c) John Sundell 2018
+ *  MIT license - see LICENSE.md
+ */
+
+pre {
+    margin-bottom: 1.5em;
+    background-color: #1a1a1a;
+    padding: 16px 0;
+    border-radius: 16px;
+}
+
+pre code {
+    font-family: monospace;
+    display: block;
+    padding: 0 20px;
+    color: #a9bcbc;
+    line-height: 1.4em;
+    font-size: 0.95em;
+    overflow-x: auto;
+    white-space: pre;
+}
+
+pre code .keyword {
+    color: #e73289;
+}
+
+pre code .type {
+    color: #8281ca;
+}
+
+pre code .call {
+    color: #348fe5;
+}
+
+pre code .property {
+    color: #21ab9d;
+}
+
+pre code .number {
+    color: #db6f57;
+}
+
+pre code .string {
+    color: #fa641e;
+}
+
+pre code .comment {
+    color: #6b8a94;
+}
+
+pre code .dotAccess {
+    color: #92b300;
+}
+
+pre code .preprocessing {
+    color: #b68a00;
+}

README.md

@@ -45,6 +45,8 @@ You'll get the following output back:
 <span class="keyword">func</span> hello(world: <span class="type">String</span>) -> <span class="type">Int</span>
 ```
 
+To be as flexible as possible, Splash doesn't hardcode any colors or other CSS attributes in the HTML it generates. Instead it simply assigns a CSS class to each token. For an example of a CSS file that can be used to style Splash-generated HTML, see [Examples/sundellsColors.css](https://github.com/JohnSundell/Splash/blob/master/Examples/sundellsColors.css).
+
 For more information about HTML generation with Splash and how to customize it, see `HTMLOutputFormat`.
 
 #### SplashImageGen