[MULI-7] Game resume

[tom-reith]

User Story
As user playing a game
I want close and reopen the app at a later time point
So that I can continue my game where I left of

Acceptance Criteria
Scenario 1: App is closed for lunch
GIVEN a game has started
WHEN the app is closed
AND the app is reopened
AND the game is choosen from the home screen
THEN the last score should be displayed

Scenario 2: App is minimized
GIVEN a game has started
WHEN the app is minimized
AND the app is reopened
THEN the last game should be shown

Technical Specifications
add technical specification if needed
This means all currently running games should be shown on the homescreen games section as a scrollable list

Dependencies
Depends on MULI-5 Start new Game