Added Demo

Added better demo content for testing to documentation.

.gitignore

@@ -0,0 +1,2 @@
+
+.DS_Store

docs/demo.md

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+<h1>Demo Content</h1>
+
+The following content is provided as a known working configuration and sample for users just getting started.
+
+***
+
+**Example App Configuration** <br />
+The following configuration will load a sample CSV playlist and images from the Exhibit GitHub repository. This configuration can be tested by adding it to your Exhibit Mobile Device App record under the **App Configuration** tab. <br />
+
+```xml
+<dict>
+    <key>edu.nebraska.ImageViewer.dataURL</key>
+    <string>https://raw.githubusercontent.com/NU-ITS/Exhibit/master/Demo/Playlist.csv</string>
+</dict>
+```
+
+***
+
+**Example CSV Playlist** <br />**Note: If using this as a template,  [please download the CSV file from GitHub here](https://raw.githubusercontent.com/NU-ITS/Exhibit/master/Demo/Playlist.csv).** The following table shows the content within the App Configuration listed above.<br />
+
+| Name      | URL                                                          | Duration | UpdateInterval | StartOn     | EndBy          | Cache |
+| --------- | ------------------------------------------------------------ | -------- | -------------- | ----------- | -------------- | ----- |
+| Exhibit01 | https://github.com/NU-ITS/Exhibit/raw/master/Demo/Exhibit01.png | 0:00:10  | 1:00:00        | 1/1/18 0:00 | 12/31/30 23:59 | yes   |
+| Exhibit02 | https://github.com/NU-ITS/Exhibit/raw/master/Demo/Exhibit02.png | 0:00:10  | 1:00:00        | 1/1/18 0:00 | 12/31/30 23:59 | yes   |
+| Exhibit03 | https://github.com/NU-ITS/Exhibit/raw/master/Demo/Exhibit03.png | 0:00:10  | 1:00:00        | 1/1/18 0:00 | 12/31/30 23:59 | yes   |
+| Exhibit04 | https://github.com/NU-ITS/Exhibit/raw/master/Demo/Exhibit04.png | 0:00:10  | 1:00:00        | 1/1/18 0:00 | 12/31/30 23:59 | yes   |
+
+***

mkdocs.yml

@@ -5,6 +5,7 @@ nav:
         - 'Installation': 'installation.md'
         - 'Managed App Config': 'app-config.md'
         - 'Content Playlist': 'playlist.md'
+        - 'Demo Content': 'demo.md'
     - About:
         - 'Release Notes': 'release-notes.md'
         - 'Known Issues': 'known-issues.md'