Finally updated the readme

-Still no content except credits, but at least we're giving it love now
Began implementing particle effects

-Created ParticleEmitter and Particle classes
-Implemented very, very basic functionality
-Not actually used yet
Fixed a bug where blocks disappear if the UFO leaves the screen

-Turns out we just didn't set the states properly
Began implementing proper game over when blocks reach the top

-Not working yet
-Removed game over code from the block system
-InGameState now checks if the blocks go over the top
Created the VarTracker class

-Will be used to track a variable and output it to a graph and csv
-No functionality yet