Add bullet
Change class Bullet and Monster from Entity to Arraylist Then Make
subclass Bullet and Monster  
Revert "Change class Bullet and Monster from Entity to Arraylist Then
Make subclass Bullet and Monster  "

This reverts commit 700ab748b3570fde71c69afa929951b4b913cee3.
I just wrong commit , I improve all file to sucessful Running
Change Movement Hero From X-axis to Y-axis
Extract Method isCollision
DELETE ENTITY AGAIN and  Create monster , bullet Upsdie with Checking
Collision
Change Background and improve hero movement
Change Background and increase HP MP if MP is Zero ,You can't fire for n
second , MP will decrease when you fire wrong bullet compare monster