Reorganise IDE examples

examples/ide/visualstudio/lib/readme.txt

@@ -0,0 +1,8 @@
+
+Documentation: http://docs.platformio.org/en/latest/userguide/cmd_init.html
+
+This directory is intended for the project specific (private) libraries.
+PlatformIO will compile them to static libraries and link to executable file.
+
+The source code of each library should be placed in separate directory.
+For example, "lib/private_lib/[here are source files]".