Add GitHub CLI to course preparation (#416)

Co-authored-by: Parker Brown <[email protected]>

docs/01_getting_ready_for_class.md

@@ -101,6 +101,16 @@ Replace `YOUR_PROXY_USERNAME` with the username used to authenticate into your p
 
 For this class, we will use a basic text editor to interact with our code. Let's make sure you have one installed and ready to work from the command-line.
 
+### Step 5: Install GitHub CLI (optional)
+
+The GitHub command-line tool has funtionality that may be useful during the labs setup.
+
+Install GitHub CLI from [here](https://github.com/cli/cli#installation), then confirm it is available on your console:
+
+```sh
+gh --version
+```
+
 #### Pick your editor
 
 You can use almost any text editor, but we have the best success with the following: