feat(exercises): :sparkles: Show a modal to select the exercises of an existing ExerciseList

[samuelsainz]

Description

In the View to see the details of an ExerciseList, we want to have a + button in the toolbar to add other exercises. To do that the SelectExercisesView is shown as a modal when the + button is tapped.

Related Issue

Closes #15

How Has This Been Tested?

Tested the next cases:

Case 1

• Create a new list
• Navigate to the list
• Tap the + button in the toolbar
• Select an exercise
• Navigate back to the list

Result: The exercise is shown in the list

Case 2

• Navigate to the list created in Case 1
• Tap the + button in the toolbar
• Remove the exercise selected
• Navigate back to the list

Result: No exercises are shown

Case 3

• Navigate to the list created in Case 1
• Tap the + button in the toolbar
• Select multiple exercises
• Navigate back to the list

Result: The correct exercises are shown

Case 4:

• Kill the app
• Open the app again
• Navigate to the list created in Case 1

Result: The list created in Case 1 contains the right exercises

Screenshots (if appropriate):

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)
• [ ] Developer tooling (fix or improve developer tooling)

Checklist:

• [x] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [x] I have read the CONTRIBUTING document.
• [ ] I have added tests to cover my changes.
• [x] All new and existing tests passed.

[heyjaywilson]

This is a good start. Only thing is can the plus button be added into the menu that already exists with a title "Add Exercise"?

[samuelsainz]

@heyjaywilson sure thing! Sorry that I missed the new menu, I've rebased and added the option to the menu in another section.

let me know if that works :)