Alert box for followers when a leader pauses, exits or ends a hike

**Is your feature request related to a problem? Please describe.**
There's no alert for the followers for when the user has paused location sharing or has ended the hike.

**Describe the solution you'd like**
Providing an alert message to the followers with respect to the actions being performed by the leader.

**Are you working on this? (Yes/No)**
Yes, if this seems like a resolvable issue. It is open for discussions :)