Update Readme (Install, Update, Usage)

README.md

@@ -1,15 +1,28 @@
 # Grav Highlight Plugin
 
+![Highlight](assets/readme_1.png)
 
 `highlight` is a [Grav](http://github.com/getgrav/grav) plugin that adds simple and powerful code highlighting functionality utilizing the jQuery plugin [Highlight.js](https://highlightjs.org/).
 
 # Installation
 
-To install this plugin, just download the zip version of this repository and unzip it under `/your/site/grav/user/plugins`. Then, rename the folder to `highlight`.
+Installing the Highlight plugin can be done in one of two ways. Our GPM (Grav Package Manager) installation method enables you to quickly and easily install the plugin with a simple terminal command, while the manual method enables you to do so via a zip file. 
+
+## GPM Installation (Preferred)
+
+The simplest way to install this plugin is via the [Grav Package Manager (GPM)](http://learn.getgrav.org/advanced/grav-gpm) through your system's Terminal (also called the command line).  From the root of your Grav install type:
+
+    bin/gpm install highlight
+
+This will install the Highlight plugin into your `/user/plugins` directory within Grav. Its files can be found under `/your/site/grav/user/plugins/highlight`.
+
+## Manual Installation
+
+To install this plugin, just download the zip version of this repository and unzip it under `/your/site/grav/user/plugins`. Then, rename the folder to `highlight`. You can find these files either on [GitHub](https://github.com/getgrav/grav-plugin-highlight) or via [GetGrav.org](http://getgrav.org/downloads/plugins#extras).
 
 You should now have all the plugin files under
 
-	/your/site/grav/user/plugins/highlight
+    /your/site/grav/user/plugins/highlight
 
 >> NOTE: This plugin is a modular component for Grav which requires [Grav](http://github.com/getgrav/grav), the [Error](https://github.com/getgrav/grav-plugin-error) and [Problems](https://github.com/getgrav/grav-plugin-problems) plugins, and a theme to be installed in order to operate.
 
@@ -74,57 +87,55 @@ You can also disable highlighting for a particular page if causes issues:
 
 Valid theme options include:
 
-```
-arta
-ascetic
-atelier-dune.dark
-atelier-dune.light
-atelier-forest.dark
-atelier-forest.light
-atelier-heath.dark
-atelier-heath.light
-atelier-lakeside.dark
-atelier-lakeside.light
-atelier-seaside.dark
-atelier-seaside.light
-brown_paper
-codepen-embed
-color-brewer
-dark
-default
-docco
-far
-foundation
-github
-googlecode
-hybrid
-idea
-ir_black
-kimbie.dark
-kimbie.light
-learn
-magula
-mono-blue
-monokai_sublime
-monokai
-obsidian
-paraiso.dark
-paraiso.light
-pojoaque
-railscasts
-rainbow
-school_book
-solarized_dark
-solarized_light
-sunburst
-tomorrow-night-blue
-tomorrow-night-bright
-tomorrow-night-eighties
-tomorrow-night
-tomorrow
-vs
-xcode
-zenburn
-```
+|                         |                        |
+| :---------------------- | :--------------------- |
+| arta                    | ascetic                |
+| atelier-dune.dark       | atelier-dune.light     |
+| atelier-forest.dark     | atelier-forest.light   |
+| atelier-heath.dark      | atelier-heath.light    |
+| atelier-lakeside.dark   | atelier-lakeside.light |
+| atelier-seaside.dark    | atelier-seaside.light  |
+| brown_paper             | codepen-embed          |
+| color-brewer            | dark                   |
+| default                 | docco                  |
+| far                     | foundation             |
+| github                  | googlecode             |
+| hybrid                  | idea                   |
+| ir_black                | kimbie.dark            |
+| kimbie.light            | learn                  |
+| magula                  | mono-blue              |
+| monokai_sublime         | monokai                |
+| obsidian                | paraiso.dark           |
+| paraiso.light           | pojoaque               |
+| railscasts              | rainbow                |
+| school_book             | solarized_dark         |
+| solarized_light         | sunburst               |
+| tomorrow-night-blue     | tomorrow-night-bright  |
+| tomorrow-night-eighties | tomorrow-night         |
+| tomorrow                | vs                     |
+| xcode                   | zenburn                |
 
 > Note: If you want to see this plugin in action, have a look at [Grav Learn Site](http://learn.getgrav.org)
+
+# Updating
+
+As development for the Highlight plugin continues, new versions may become available that add additional features and functionality, improve compatibility with newer Grav releases, and generally provide a better user experience. Updating Highlight is easy, and can be done through Grav's GPM system, as well as manually.
+
+## GPM Update (Preferred)
+
+The simplest way to update this plugin is via the [Grav Package Manager (GPM)](http://learn.getgrav.org/advanced/grav-gpm). You can do this with this by navigating to the root directory of your Grav install using your system's Terminal (also called command line) and typing the following:
+
+    bin/gpm update highlight
+
+This command will check your Grav install to see if your Highlight plugin is due for an update. If a newer release is found, you will be asked whether or not you wish to update. To continue, type `y` and hit enter. The plugin will automatically update and clear Grav's cache.
+
+## Manual Update
+
+Manually updating Highlight is pretty simple. Here is what you will need to do to get this done:
+
+* Delete the `your/site/user/plugins/highlight` directory.
+* Downalod the new version of the Highlight plugin from either [GitHub](https://github.com/getgrav/grav-plugin-highlight) or [GetGrav.org](http://getgrav.org/downloads/plugins#extras).
+* Unzip the zip file in `your/site/user/plugins` and rename the resulting folder to `highlight`.
+* Clear the Grav cache. The simplest way to do this is by going to the root Grav directory in terminal and typing `bin/grav clear-cache`.
+
+> Note: Any changes you have made to any of the files listed under this directory will also be removed and replaced by the new set. Any files located elsewhere (for example a YAML settings file placed in `user/config/plugins`) will remain intact.