Update sm image for sm_simple_action_client (#693)

* Added sm image to sm_nav2_unit_test_1

* Update sm image for sm_cl_keyboard_unit_test_1

* Update sm image for sm_multithread_test_1

* Update sm image for sm_simple_action_client

Author: brettpac

smacc2_sm_reference_library/sm_simple_action_client/README.md

@@ -1,5 +1,7 @@
 # SM Simple Action Client
 
+ ![sm_simple_action_client](docs/SmSimpleActionClient_2025-12-21_225014.svg)
+
 A SMACC2 tutorial demonstrating topic subscription and action client patterns.
 
 ## Overview