Added Entity class
Modified classes to prepare input
Added Land class
Updeted readme

Updated to say how to compile and run everything on windows/linux machine.
Update README.md
Update README.md
Modified the makefile for linux
readme updated
Added input

Exiting game through esc works, but I wasn't sure where to define downPressed etc so they don't work yet.
Update Renderer.java

Drew and filled colour into some shapes, changed their positions in the panel and tried varying the thickness of shape outlines. 
Made Code to compile, some comments added
Added graphics tutorial link
Renamed input booleans
Update Input.java
More explanation on how git works added
Update JavaTanks.java
ranamed to OOTanks
renamed stuff to OOTanks
renamed stuff to OOTanks
Moved forward to create Tank class