Upgrading Microsoft Visual Studio toolchain (#502)

* Microsoft Visual Studio 2022 Community Edition contribution ( ports/win )

* Incorporated MSVC 2022 into ports/win32 directory

* merge readme.txt into README.md

---------

Co-authored-by: Steve Karg <skarg@users.sourceforge.net>

ports/win32/README.md

@@ -1,10 +1,20 @@
-# Makefile build under MinGW32
+# Win32 ports for BACnet
 
-* MSYS2 installation is:
+This directory contains a demo program that compiles with a Win32 compiler.
+It was tested with the free MinGW32 MSYS2 GCC compiler
+and the (free) Microsoft Visual Studio Community Edition
+
+## Building with Makefile under MinGW32
+
+Note: Building for 64-bit with MinGW64 requires extra runtimes, 
+whereas building for 32-bit as Win32 doesn't require any other 
+files for the EXE to work in any version of Windows.
+
+* MSYS2 installation is (from powershell):
 
     c:\> winget install --id=MSYS2.MSYS2  -e
 
-* Start MSYS, and install MinGW32.
+* Start MSYS shell, and install MinGW32.
 
     $ pacman -Syu mingw-w64-i686-toolchain
 
@@ -33,3 +43,13 @@
      make --version
      
      Built for Windows32
+
+## Building and running with Microsoft Visual Studio
+
+* Obtain the (free) Microsoft Visual Studio Community Edition, or use your professional version. Currently tested to MSVC 2022
+* Open solution file ports/win32/Microsoft Visual Studio/bacnet-stack.sln
+* Set startup project to be the desired application project, e.g. "server"
+* In the active project properties, debugging, set command line to desired DeviceID
+* In active project properties, debugging, set environment variables as appropriate, e.g. BACNET_IFACE=10.59.2.1 BACNET_IP_PORT=53004
+* Compile & run
+* Questions? edward@bac-test.com