update readme

src/multi-app/ReadMe.txt

@@ -1,13 +1,21 @@
+This directory contains code for fitting the localized factor model described
+in the following paper:
 
-(0) See Notation.txt first.
+       Deepak Agarwal, Bee-Chung Chen, Bo Long. Localized factor models for 
+       multi-context recommendation. KDD 2011.
+
+This model jointly factorizes multiple matrices to provide transfer learning
+across multiple contexts or applications.
+
+(0) See Notation.txt for the model first.
 
 (1) To compile, just type make in this directory.
     see Makefile for details.
 
 (2) Some C and R functions used are in
     ../R/utils.{c,h,hpp,R}
 
-(3) Please DO NOT check in .o and .so files or data files into CVS
+(3) Please DO NOT check in .o and .so files into the repository
 
 Directories:
   C/           C and C++ code