Added empty add-on.css and add-on.js files and extended the documenta…

…tion to explain their purpose.

README.md

@@ -169,6 +169,11 @@ _false_ will turn a feature **off**. It is structured as follows:
 └── .Social  // Controls Links to Social Media
 ```
 
+### Custom JavaScript and CSS
+
+You can adapt this theme according to your preferences using your own JS or CSS code.
+To do this your can write your code in `static/css/add-on.css` and `static/js/add-on.js`.
+
 ### Hugo's Built-In Server
 
 To see a live version of your site locally, use the following command:

static/css/add-on.css

@@ -0,0 +1,6 @@
+/*
+  This css file is for individual users to restyle items for their personal site,
+  or for the implementation of features specifically for their site. Anything that
+  is an official part of the theme (ex. Pull Requests) should be included in main.css
+  and follow the formatting and style given.
+*/

static/js/add-on.js

@@ -0,0 +1,6 @@
+/*
+  This js file is for individual users to modify the scripts for their personal site,
+  or for the implementation of features specifically for their site. Anything that
+  is an official part of the theme (ex. Pull Requests) should be included in main.js
+  and follow the formatting and style given.
+*/