[pango/pango2] README.win32: Convert to MarkDown

[Matthias Clasen <matthiasc src gnome org>]

commit 5d27fd8ffae9a16d8bd0e2859b409528e72a2d3b
Author: Chun-wei Fan <fanchunwei src gnome org>
Date:   Fri Jun 24 10:58:54 2022 +0800

    README.win32: Convert to MarkDown
    
    This makes the text formatting more pleasing to the eye on a web browser.

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+Using Pango for Windows
+=======================
+
+The Pango backend written for Win32 is pangowin32. Pangowin32 uses
+the Win32 DirectWrite font API. GTK+ 2.8 and later on Win32 however
+actually uses the pangocairo backend (which then uses only small parts of
+pangowin32). Much of the DirectWrite font API calls are in cairo.
+
+Building Pango for Windows
+==========================
+
+You need to have gcc (mingw-w64) or Visual Studio 2015 or later, along with
+Python 3.6.x+ and Meson 0.55.3 at the time of writing.  However, if you do
+not have HarfBuzz installed and are building it as part of building Pango
+with Visual Studio, you will need to use Visual Studio 2017 (the latest
+15.9.x release is recommended) or later.
+
+If building the introspection files, you will also need to ensure that
+the Python release series and build architecture (i.e. Win32 (x86)/
+x64 (amd64/x86-64) matches the Python release series and build
+architecture that was used to build GObject-Introspection.  Check whether
+the Python installation/interpreter path indicated by the shebang line in
+the `g-ir-scanner` script in your `%PATH%` matches your build
+architecture.
+
+The Ninja build utility must also be in your PATH, unless using the
+Visual Studio IDE as noted below.
+
+Cross-compiling Pango for ARM64/aarch64 with Visual Studio 2017 or later
+is also supported, provided if a cross compilation file for Meson is
+properly setup for such builds (please refer to the Meson documentation
+for further instructions).  Support for introspection for ARM64 builds is
+currently not supported, due to the lack of an official build of Python
+for ARM64 Windows, and introspection builds are currently not supported
+for any cross-builds.
+
+You will also need the following libraries installed with their headers
+and import libraries, and their DLLs, if applicable, needs to be found in
+`%PATH%`.  All of their required dependencies are required as well.  Their
+pkg-config files are needed on all builds:
+
+- GLib
+- Fribidi
+- Cairo (With Win32+DirectWrite support built in, optionally libpng support)
+- HarfBuzz (GLib, GObject and DirectWrite support required)
+
+Please see `meson.build` to see what versions are needed for these dependencies.
+
+Follow the following steps to build Pango:
+
+1) Invoke the Meson configuration as follows, in a directory separate from the sources:
+
+   (With MinGW, please adjust the paths accordingly, in a MSYS/MSYS2 bash prompt)
+    ```
+   PATH=/devel/dist/glib-2.8.0/bin:$PATH ACLOCAL_FLAGS="-I /devel/dist/glib-2.8.0/share/aclocal" 
PKG_CONFIG_PATH=/devel/dist/glib-2.8.0/lib/pkgconfig:$PKG_CONFIG_PATH CC='gcc -mtune=pentium3' 
CPPFLAGS='-I/opt/gnu/include' LDFLAGS='-L/opt/gnu/lib' CFLAGS=-O meson $(PATH_TO_SRC) 
--buildtype=$(buildtype) --prefix=$(PREFIX)
+   ```
+
+   (With Visual Studio, set the `INCLUDE`, `LIB`, `PATH` and envvars as
+   needed before running the following in a Visual Studio command prompt)
+   ```
+   meson $(PATH_TO_SRC) --buildtype=$(buildtype) --prefix=$(PREFIX) [--pkg-config-path=...]
+   ```
+
+   For Visual Studio builds, support for building using the Visual Studio IDE
+   is also supported to some extent.  Append `--backend=vs` to the Meson
+   configuration command above to use this support.  Note that this support
+   may not work as well as the builds that are carried out by Ninja, and
+   issues in regards to building with Meson using Visual Studio with the IDE (i.e.
+   `msbuild`) should be reported to the Meson project.
+
+2) Build Pango by running Ninja, or by opening and building the generated
+   Visual Studio solution file.
+       
+3) Run tests and/or install the build using the `test` and `install` targets
+   or sub-projects respectively.
+
+See the following GNOME Live! page for a more detailed description of building
+Pango's dependencies with Visual Studio:
+
+https://live.gnome.org/GTK%2B/Win32/MSVCCompilationOfGTKStack