🔊 Add background sounds to levels + mute button

[GARYPOU]

Hello guys, i did it.
This PR implements background audio for the game levels, along with a mute toggle button to give players control over the sound.

• Added background sound that plays automatically when a level starts.
• Implemented a mute/unmute button accessible during gameplay.
• Sound state is preserved when toggling between mute and unmute.
  I test it in the 1 player and multy player mode and it work on both.
  If you don t like something, tell me and i can change it :).

[codergautam]

Could you let me know where you are getting these sounds and if they are properly licensed? Thank you!

[GARYPOU]

Hi, quick update on the sounds from my previous message: those weren't properly licensed, so please don't include them in the PR. I'll replace them with royalty-free, license-free alternatives and follow up soon. Apologies for the oversight!
Here is the link of the new web where i downloaded new sounds. https://pixabay.com/music/search/?order=ec