added start button
added game over screen, more text,  background
added game over screen, more text, background

last commit was just background changed
made start button rect invisible
added lives
change : for every 20 that u miss u lose a life. total of 3 lives
added comments
restarting the game every time works
every time score increases by 10 lives increase
put some of the code in proper place
added the flowchart