add gps to readme

README.md

@@ -21,6 +21,18 @@ You may also want to add a comment:
 set comment Hello World!
 ```
 
+And possibly enable GPS:
+
+```
+set gps receiver
+```
+
+It may also be a good idea to look at all the settings to make sure they're how you want them:
+
+```
+get
+```
+
 Don't forget to enable transmitting and save your settings:
 
 ```