Add ReadMe

ReadMe.txt

@@ -0,0 +1,7 @@
+The package contains the implementation of Yen's algorithm for top-k shortest paths in a directed weighted graph. 
+
+Note that:
+1. It's implemented in CPP. (The version is 2)
+2. The source code is compiled under visual studio 2008 c/c++ compiler. 
+3. Compared with previous versions, version 2 does not require Boost library any longer.
+4. Main() function explains how to use the implentation.