Everstone Capstone Project: Unity work part IV

Short update, I have added sound to my game. 
Made sure to find royalty-free sound to use from purple planet sound and free sound.

I tried to add a footstep sound to the player but it was atrocious when in action so removed that.
Game now has a looping background sound that plays on both the menu and level, key collected sound, button hover and clicks sounds, player death sound and a *very* quiet jump sound.

To ensure things played correctly, I made a SoundManager script and applied all the right code to the areas in other scripts needed while referencing back to the manager.