Adding info for generate.vbs settings to use SDL on VS project files

SDL_Win32.txt

@@ -7,12 +7,25 @@ However, it is possible using SDL libraries to improve the experience
 window size.


Settings for Compiling
----------------------
You can edit generate.vbs script to preconfigure Visual Studio
 project files (re)creation. Set at line 33:
graph_config = "SDL"
 or
graph_config = "SDL2"
Saving and launching vbscript you will obtain new VS project files
 with correct included to solution files list.
Then follow the steps below.


Compiling SDL 1.2
-----------------
After setting up SDL 1.2 libraries, to successfully compile on MSVC,
 going to Project Properties (All Configurations):
- on C/C++=>Preprocessor, set WITH_SDL into Preprocessor Definitions
- on Linker=>System, set /SUBSYSTEM:WINDOWS or /SUBSYSTEM:CONSOLE
- if you did not put "#undef main" directive on opendune.c source, go
   on Linker=>System and set /SUBSYSTEM:WINDOWS or /SUBSYSTEM:CONSOLE
   (to define entry point on main for SDL)
- on Linker=>Command Line, set /FORCE:MULTIPLE on Additional Options
   (to avoid 'multiple definitions' problems)
@@ -23,8 +36,9 @@ Compiling SDL 2.0
After setting up SDL 2.0 libraries, to successfully compile on MSVC,
 going to Project Properties (All Configurations):
- on C/C++=>Preprocessor, set WITH_SDL2 into Preprocessor Definitions
- on Linker=>System, set /SUBSYSTEM:WINDOWS or /SUBSYSTEM:CONSOLE
  (to define entry point on main for SDL)
- if you did not put "#undef main" directive on opendune.c source, go
   on Linker=>System and set /SUBSYSTEM:WINDOWS or /SUBSYSTEM:CONSOLE
   (to define entry point on main for SDL)


Additional Features