update gitignore

.gitignore

+.vscode
 .idea
 cmake-build-debug
 .catkin_tools/

.gitmodules

@@ -29,3 +29,7 @@
 [submodule "src/tutorial_ros_pub_sub"]
 	path = src/tutorial_ros_pub_sub
 	url = ../../ceti/ros/ceti-summer-school/tutorial_ros_pub_sub.git
+[submodule "src/introductory_task"]
+	path = src/introductory_task
+	url = ../introductory_task.git
+	branch = master

introductory_task @ 0082c0ef

+Subproject commit 0082c0efac6db66a0c71399de21f7456a9d6409e