Mentorship-android: Settings screen misses in-app back button

[isabelcosta]

Description

As a user,
I need a back button on settings screen,
so that I can understand the navigation level I'm in.

Mocks

Acceptance Criteria

Update [Required]

• [ ] Put a back button in the action bar of Settings screen

Definition of Done

• [ ] All of the required items are completed.
• [ ] Approval by 1 mentor.

Estimation

1 hours

[chhavi1614]

I would like to work on this issue !!

[m-murad]

@chhavi1614 please send a PR