added exercise model for exercise table(id, user id, exercise name, exercise duration, calories burned)
added exercise controller( GET request to fetch exercies by uid and date upon user login and show it in list of completed exercises, POST request for adding exercise data)
added exercise repository ( find by user id and exercise date)
added exercise model for exercise table(id, user id, exercise name, exercise duration, calories burned) added exercise controller( GET request to fetch exercies by uid and date upon user login and show it in list of completed exercises, POST request for adding exercise data) added exercise repository ( find by user id and exercise date)