readme: added how to run

Author: kerryz

README.md

@@ -1,2 +1,7 @@
 # About
-Python implementation of GFA (Group Factor Analysis). Based on the R package [CCAGFA](http://cran.r-project.org/package=CCAGFA).
+Python implementation of GFA (Group Factor Analysis). Based on the R package [CCAGFA](http://cran.r-project.org/package=CCAGFA).
+
+# How to run
+Just run `gfa_experiment.py` in the root directory
+
+    python gfa_experiments.py