[gsettings-desktop-schemas] Add README.txt for MSVC/NMake installations

[Chun-wei Fan <fanchunwei src gnome org>]

commit ca4bd9defd66bed4cf9f229e79e2be68daba6227
Author: Chun-wei Fan <fanchunwei src gnome org>
Date:   Mon Oct 5 15:40:00 2015 +0800

    Add README.txt for MSVC/NMake installations
    
    This tells the person installing this package using an MSVC-based
    development environment how to build and "install" the gschema files.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=723734

 build/win32/Makefile.am |    1 +
 build/win32/README.txt  |   65 +++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 66 insertions(+), 0 deletions(-)
---
diff --git a/build/win32/Makefile.am b/build/win32/Makefile.am
index 6025eef..74341ef 100644
--- a/build/win32/Makefile.am
+++ b/build/win32/Makefile.am
@@ -26,6 +26,7 @@ EXTRA_DIST = \
        introspection-msvc.mak                  \
        replace.py                              \
        uri.py                                  \
+       README.txt                              \
        $(GENERATED_ITEMS)
 
 -include $(top_srcdir)/git.mk
diff --git a/build/win32/README.txt b/build/win32/README.txt
new file mode 100644
index 0000000..26ef824
--- /dev/null
+++ b/build/win32/README.txt
@@ -0,0 +1,65 @@
+Please refer to the following GNOME Live! page for more detailed
+instructions on building this package with Visual C++:
+
+https://live.gnome.org/GTK%2B/Win32/MSVCCompilationOfGTKStack
+
+The gsettings-desktop-schemas-msvc.mak is an NMake Makefile that is meant
+to be used to generate the gsettings schema files and an enumeration
+XML file that is to be copied and "installed" on the running system
+by being copied to your gsettings schemas folder and processed by the
+glib-compile-schemas tool, where glib-compile-schemas is a part of the
+GLib package.
+
+The required dependencies are as follows:
+
+-An up-to-date GLib installation that was built with the Visual Studio version that
+ you intend to run gsettings-desktop-schemas-msvc.mak with, in the location pointed
+ to by $(PREFIX), which is <parentdir_of_srcroot>\vs<Visual Studio Version>\$(Platform)
+ unless set as some other paths otherwise, where Platform is Win32 for 32-bit builds
+ and x64 for x86-64 builds.
+
+-The glib-mkenums PERL script, that is found from the GLib sources that you have built
+ and installed above.  Copy gobject\glib-mkenums.in from the GLib source tree to
+ $(PREFIX)\bin\glib-mkenums, and change the
+ @GLIB_VERSION@ in that file to match the version of GLib that you have built and
+ installed, if it is not there yet.
+
+-A working installation of PERL, which could either be built from the sources or obtained
+ from distributions such as Strawberry PERL or ActiveState PERL.
+
+-A working installation of Python 2.7.x+ or 3.x, which could be built from the sources or
+ obtained from the installers from http://www.python.org.
+
+For introspection building, you will also need:
+-An up-to-date gobject-introspection installation that was built with the Visual Studio
+ version that you intend to run gsettings-desktop-schemas-msvc.mak with, including the
+ introspection files that are built with that package, in $(PREFIX).  Currently,
+ for introspection building, Python 2.7.x must be used; Python 3.x is currently not
+ supported.
+
+Run 'nmake /f gsettings-desktop-schemas-msvc.mak' to generate the needed schema files.
+If building the introspection files is desired, run 
+'nmake /f gsettings-desktop-schemas-msvc.mak introspection'.  A 'clean' target is
+provided to remove all the generated files.
+
+Please refer to the README.txt file in $(GLib_src_root)\build\win32\vs<Visual Studio Version>
+on how to build GLib using your version of Visual Studio.  Versions 2008 through 2015 are
+currently supported.
+
+Set up the source tree as follows under some arbitrary top
+folder <root>:
+
+<root>\<this-gsettings-desktop-schemas-source-tree>
+<root>\<Visual Studio Version>\<PlatformName>
+
+*this* file you are now reading is thus located at
+<root>\<this-gsettings-desktop-schemas-source-tree>\build\README.txt
+
+The "install" target will copy build results and headers into their
+appropriate location under <root>\vs<Visual Studio Version>\<PlatformName>.
+For instance, the *.schema.xml and *.enums.xml files will go into
+<root>\vs<Visual Studio Version>\<PlatformName>\share\glib-2.0\schemas,
+the header file goes into
+<root>\vs<Visual Studio Version>\<PlatformName>\include\gsettings-desktop-schemas.
+
+--Chun-wei Fan <fanc999 gmail com>