chore: release all resources after activity is destroyed

[sarwataijaz]

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Description

Please include a summary of the change and which issue is fixed. Please also include relevant motivation and context. List any dependencies that are required for this change.

• I added the onDestroy method in the MainActivity, as when the app was running and despite the activity being destroyed, the music resources were still not released so here directly stopping it in the onDestroy method seemed sufficient.

Fixes # (issue)

Type of change

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[github-actions]

Thanks so much for your contribution, really appreciated! We will have a look and merge it if everything checks out!