Add Live Score Display on Game Header

[punishermortal]

The objective of this issue is to add a "LIVE SCORE" label to the game header section and ensure the current score value is dynamically displayed next to it. The live score should be easily visible to users during gameplay, positioned on the left side of the top of the screen. Specifically:

1. Modify the existing index.html to include a "LIVE SCORE" label.
2. Ensure the current score (available in the ) is displayed next to the "LIVE SCORE" label.
3. Update any associated CSS in Alien.css to ensure proper positioning and styling, making it visible and aesthetically consistent with the rest of the game's UI.
   

[punishermortal]

@YadavAkhileshh ,There should be a "LIVE SCORE" label to the game header section,please assign this features to me.