docs: added tutorials overview and tutorial 6

docs/tutorials/overview.md

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+# CORE Tutorials
+
+These tutorials will cover various use cases within CORE. These
+tutorials will provide example python, gRPC, XML, and related files, as well
+as an explanation for their usage and purpose.
+
+## Checklist
+
+These are the items you should become familiar with for running all the tutorials below.
+
+* [Install CORE](../install.md)
+* [Tutorial Setup](setup.md)
+
+## Tutorials
+
+* [Tutorial 1 - Wired Network](tutorial1.md)
+    * Covers interactions when using a simple 2 node wired network
+* [Tutorial 2 - Wireless Network](tutorial2.md)
+    * Covers interactions when using a simple 3 node wireless network
+* [Tutorial 3 - Basic Mobility](tutorial3.md)
+    * Covers mobility interactions when using a simple 3 node wireless network
+* [Tutorial 4 - Tests](tutorial4.md)
+    * Covers automating scenarios as tests to validate software
+* [Tutorial 5 - Access Windows](tutorial5.md)
+    * Covers using the RJ45 node to connect a Windows OS
+* [Tutorial 6 - Improve Visuals](tutorial6.md)
+    * Covers changing the look of a scenario within the CORE GUI
+* [Tutorial 7 - EMANE](tutorial7.md)
+    * Covers using EMANE within CORE for higher fidelity RF networks

docs/tutorials/tutorial6.md

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+# Tutorial 6 - Improved Visuals
+
+## Overview
+
+This tutorial will cover changing the node icons, changing the background, and changing or hiding links.
+
+## Files
+
+Below is the list of files used for this tutorial.
+
+* drone.png - icon for a drone
+* demo.py - a mobility script for a node
+* terrain.png - a background
+* completed-scenario.xml - the scenario after making all changes below
+
+## Running this Tutorial
+
+This section will cover running this sample tutorial that develops a scenario file.
+
+* Ensure that **/etc/core/core.conf** has **grpcaddress** set to **0.0.0.0**
+* Make sure the **core-daemon** is running in a terminal
+    ```shell
+    sudop core-daemon
+    ```
+* In another terminal run the GUI
+    ```shell
+    core-gui
+    ```
+
+### Changing Node Icons
+
+* Create three MDR nodes
+   <p align="center">
+     <img src="/static/tutorial6/create-nodes.png" width="80%">
+   </p>
+* Double click on each node for configuration, click the icon and set it to use the **drone.png** image
+   <p align="center">
+     <img src="/static/tutorial6/configure-icon.png" width="50%">
+   </p>
+* Use **Session -> Options** and set **Control Network 0** to **172.16.0.0./24**
+
+### Linking Nodes to WLAN
+
+* Add a WLAN Node
+* Link the three prior MDR nodes to the WLAN node
+   <p align="center">
+     <img src="/static/tutorial6/linked-nodes.png" width="50%">
+   </p>
+* Click play to start the scenario
+* Observe wireless links being created
+   <p align="center">
+     <img src="/static/tutorial6/wlan-links.png" width="50%">
+   </p>
+* Click stop to end the scenario
+* Right click the WLAN node and select **Edit -> Hide**
+* Now you can view the nodes in isolation
+   <p align="center">
+     <img src="/static/tutorial6/hidden-nodes.png" width="50%">
+   </p>
+
+### Changing Canvas Background
+
+* Click **Canvas -> Wallpaper** to set the background to terrain.png
+   <p align="center">
+     <img src="/static/tutorial6/select-wallpaper.png" width="50%">
+   </p>
+* Click play to start the scenario again
+* You now have a scenario with drone icons, terrain background, links displayed and hidden WLAN node
+   <p align="center">
+     <img src="/static/tutorial6/scenario-with-terrain.png" width="80%">
+   </p>
+
+## Adding Mobility
+
+* Open and play the **completed-scenario.xml**
+* Double click on **n1** and run the **demo.py** script
+   ```shell
+   # node id is first parameter, second is total nodes
+   /opt/core/venv/bin/python demo.py 1 3
+   ```
+* Let it run to see the link break as the node 1 drone approches the right side
+   <p align="center">
+     <img src="/static/tutorial6/only-node1-moving.png" width="80%">
+   </p>
+* Repeat for other nodes, double click on **n2** and **n3** and run the demo.py script
+   ```shell
+   # n2
+   /opt/core/venv/bin/python demo.py 2 3
+   # n3
+   /opt/core/venv/bin/python demo.py 3 3
+   ```
+* You can turn off wireless links via **View -> Wireless Links**
+* Observe nodes moving in parallel tracks, when the far right is reached, the node will move down
+  and then move to the left. When the far left is reached, the drone will move down and then move to the right.
+   <p align="center">
+     <img src="/static/tutorial6/scenario-with-motion.png" width="80%">
+   </p>