Add start time of workout to History view

[nano9g]

Is your feature request related to a problem? Please describe. When looking through the workout history, I would find it very helpful to have the start time displayed without needing to tap into the workout.

Describe the solution you'd like I think this could be accomplished by using an icon to indicate the workout type and replacing the current workout text with the start time.

Here's a rough mockup of how this could look: