Resolve "Add settings button"

Added

• soundeffect
• bacground music
• settings button
• go back button

changed milestone to %Phase 3

added Doing label

assigned to @rebekast

marked the checklist item soundeffect as completed

marked the checklist item bacground music as completed

marked the checklist item settings button as completed

marked the checklist item go back button as completed

added 1 commit

• 65640536 - removed a code comment

Compare with previous version

approved this merge request

merged

mentioned in commit b0fde34e