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Compiling.md

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+## Windows
+Various software and tools are required to compile Snes9x on Windows:
+
+NOTE: Unicode support requires a special zlib build - see the end of the zlib entry
+
+- The current official binary is compiled with Visual Studio 2017, you'll have to create
+  your own project file for earlier MSVC versions. VS2017 will automatically ask to install
+  the correct Windows SDK Version (7.1A)
+
+- A recent DirectX SDK:
+  https://www.microsoft.com/en-us/download/details.aspx?id=23549
+
+- The following modules can all be downloaded automatically by using:
+      git submodule update --init
+  in the cloned Snes9x git directory, or by using git GUI tools to do the same.
+  This is the recommended method of installing these dependencies.
+
+    * DirectXMath. The source files should reside in `win32/DirectXMath`
+
+    * zlib (optional, ZLIB define, enabled by default) - the default solution includes a zlib
+      project that builds appropriately (force includes `_tfwopen.h` for unicode support in s9x).
+      The zlib source files should reside in `win32/zlib/src`
+
+    * libpng (optional, HAVE_LIBPNG define, enabled by default) - the default solution includes
+      a libpng project that builds appropriately.
+      The libpng source files should reside in `win32/libpng/src`
+
+    * glslang and SPIRV-Cross (optional, USE_SLANG define, enabled by default)
+      These are needed to build support for .slang shaders. The default solution includes
+      a series of projects encompassing glslang that build appropriately.
+      The glslang source files should reside in `win32/glslang/src`
+      The SPIRV-Cross source files should be placed in `shaders/SPIRV-Cross`
+
+      If wish to compile without USE_SLANG, you must remove the files named
+      `spirv_*.cpp` from the Visual Studio project's Shaders group.
+
+- To compile Snes9x:
+    Start up VS2017.
+    Load the Snes9x solution.
+    Select the desired configuration and build.
+    The Release configuration may build significantly slower than Debug.
+    Then you can run it.