Add missing README.md for my_controlller and fix bash script

src/my_controller/README.md

@@ -0,0 +1,14 @@
+# my_controller
+
+Here's a simple ROS2 package that demonstrates how integration test
+(aka level 2 unit test) can be done using GoogleTest.
+
+Note: The integration test used in this example is purposely kept
+simple.  It makes system() calls with the following assumption:
+
+  - Linux OS
+  - pkill command
+
+For a more portable ROS2 integration test framework, consider using catch_ros2:
+
+  https://github.com/ngmor/catch_ros2

src/my_controller/scripts/run_me_for_fun.bash

@@ -34,13 +34,16 @@ function signal_handler {
     echo "You have pressed control-c $N/3 times"
     if [[ $N == "3" ]]; then
         echo "Bye"
-        exit 0;
+        # Clean all processes in this procees grouop (including itself)
+        kill -9 -$$
     fi
     N=$(( N + 1 ))
 }
 trap signal_handler SIGINT 
 
-# 4.) Child process
+# 4.) Child processees
+sleep 1000&
+sleep 1000&
 sleep 1000&
 
 # 5.) Wait for all children to exit