Update README.md

Author: guoqi1123

README.md

@@ -1,2 +1,8 @@
-# focaltrack
-http://vision.seas.harvard.edu/focaltrack/
+# Focal Track
+This repository accompanies Guo et al. [1], with the code of the focal track algorithm. For more information of the paper, please go to the project website http://vision.seas.harvard.edu/focaltrack/.
+
+## Prerequisite
+* Python 3.5, with packages numpy, 
+
+2. Tensorflow
+3.