Update README with workout completion stats

Added additional information about workout stats.

Author: RKBoss6

apps/workouts/README.md

@@ -2,5 +2,11 @@
 A simple, all-in one workout tracking app. Start a workout to see heart rate, calories burned (if the `Calories` module is installed), and steps accumulated.
 
 The calories module is installed by default when you install this app, but the app will work without the calories module, just without calorie data.
+
+When you finish a workout, you'll see the following stats:
+- Time Elapsed
+- Calories Burned
+- Average Heart Rate
+- Max Heart Rate
 ## Author
 RKBoss6