updated readme.

README.md

-# hfo
-[Half Field Offense in Robocup 2D Soccer](http://www.cs.utexas.edu/~AustinVilla/sim/halffieldoffense/)
+hfo
+===============
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+
+[Half Field Offense in Robocup 2D Soccer](http://www.cs.utexas.edu/~AustinVilla/sim/halffieldoffense/) is a subtask in RoboCup simulated soccer, modeling a situation in which the offense of one team has to get past the defense of the opposition in order to shoot goals. 
+
+# Install
+HFO depends on several libraries:
+ - [rcssserver](http://sourceforge.net/projects/sserver/files/rcssserver/15.2.2/)
+ - [librcsc](http://en.sourceforge.jp/projects/rctools/downloads/51941/librcsc-4.1.0.tar.gz/)
+ - [soccerwindow2](http://en.sourceforge.jp/projects/rctools/downloads/51942/soccerwindow2-5.1.0.tar.gz/)
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