New Workout

[santosderek]

What would you like to add? User should be able to add a new workout and be shown the workout within their overview page.

Describe the solution you'd like (If needed)

• [x] Overview page should show all of User's created workouts.
• [x] New workout page should give users a form of all information within the workout class diagram.
• [x] Use /new_workout route.
• [x] POST to /new_workout should add workout to database
• [x] If not logged in redirect to login page.
• [x] Provide Unit tests to test_flask and test_database for all newly added functions.