few more CLI tweaks

tools/ugv_cmd.py

@@ -65,7 +65,7 @@ class UGV_CLI:
             print("{}: {}".format(names, cmd.description))
         print()
 
-    @cli_cmd(names=["exit", "q"], description="Quit the program")
+    @cli_cmd(names=["exit", "q", "C-d", "C-c"], description="Quit the program")
     def exit(self):
         self.is_running = False
 
@@ -149,6 +149,7 @@ class UGV_CLI:
         time.sleep(0.2)
         last_line = None
         try:
+            print("Run 'help' to find out what commands are available")
             while self.is_running:
                 line = input("UGV> ")
                 if len(line) is 0 and last_line is not None: