compiler: move README_Windows.md content to README.md

fix compiler/cpp/Makefile.am
diff --git a/compiler/cpp/Makefile.am b/compiler/cpp/Makefile.am
index 0013121..d6cf4c3 100644
--- a/compiler/cpp/Makefile.am
+++ b/compiler/cpp/Makefile.am
@@ -107,10 +107,10 @@
 WINDOWS_DIST = \
              compiler.sln \
              compiler.vcxproj \
-             compiler.vcxproj.filters \
-             README_Windows.md
+             compiler.vcxproj.filters
 
 EXTRA_DIST = \
+             README.md \
              $(WINDOWS_DIST)
 
 clean-local: