Setup basic UITableView

- Added UITableViewDelegate & Datasource methods and hooked them up to ViewController (via the Storyboard)
- Added ExerciseTableViewCell and associated it with ViewController in the Storyboard
- Embedded UITableView in Navigation Controller, (creating the NavBar @ the top of the screen) - (Editor > Embed In > NavigationController)

Signed-off-by: Gemma Barlow <gemma@harrys.com>
Merge pull request #1 from aspro83/gb-setup-table-view

Setup basic UITableView