[Main Function] exoRehab is a solution created for rapid recovery of musculoskeletal rehabilitation patients. This application is to control and collect the bio-signal via the medical device, 'exoRehab'. * exoRehab device is sold separately 1. Knee condition measurement - Knee joint angle and muscle strength are quantitatively measured and presented 2. Rehabilitation exercise program - Systematic exercise assistance program with gamified solutions. 3. Tracking & browsing status improvement tre