Converted documentation folder into wiki submodule

documentation/.gitkeep

documentation/Multi-platform Integration.md

documentation/ci_faq.md

documentation/how_to_calibrate_the_camera_system.md

documentation/how_to_charge_lipo.md

documentation/how_to_demo.md

documentation/how_to_document_things_on_gitlab.md

documentation/how_to_use_git.md

documentation/images/.gitkeep

documentation/images/CameraGroundPlane.jpg

documentation/images/OptiTrack_Tracking_Tools.PNG

documentation/images/battery_placement.jpg

documentation/images/comp_graph_ex1.png

documentation/images/comp_graph_ex1_simu.png

documentation/images/comp_graph_reset.png

documentation/images/ls_output_wifiap.png

documentation/images/simulink_act_sys.png

documentation/images/simulink_control_sys.png

documentation/images/simulink_lqr_control.png

documentation/images/simulink_lqr_sensor.png