Update readme.txt

readme.txt

-
 Title: readme 
 
 SCOTS is a C++ tool (with a small Matlab interface) to synthesize controller for
@@ -24,6 +23,7 @@ SCOTS is a header only library. You only need to add SCOTS source directory to
 the include directory in the compiler command. 
 
 Further details are found in the readme files in example directories and in the manual.
+For installing and running SCOTS on Windows, please refer to the readmewin.txt file.
 
 Directory structure
 ============