added readme

README

+list of scripts:
+
+distrib.py:
+ INPUT: reference data RFreturns.csv (as defined in regimes.ini)
+ OUTPUT: list of (mu, sigma) time series (window, overlap defined in regimes.ini)
+
+-> covariances output is mastercovlist.plk (as defined in regimes.ini)
+
+
+makeclusters.py:
+ INPUT: covariance, regimes.ini
+ OUTPUT : regimes (regimes.plk)
+
+
+graphs.py:
+
+usage= graph.py -w [clusters | regimes| ticker ] -i file
+produce graph of regimes/cluster or time series. If time series, -i <ticker> 
+<file> otherwise is a plk file (default : regimes.plk, clusters.plk)
+