Service to run the launch file at boot

[literally-anything]

Added instructions on how to setup the workspace so the service can find the script.

Also setup the Micro ROS Agent as a submodule, so anybody who clones the repo gets the same version.

TODO

• [x] Add submodules for the px4_msgs and px4_ros_com
• [ ] Submodule for web_video_server
• [ ] Submodule for cv_camera

[dbaldwin]

💯 can't wait to test. Thanks @literally-anything !