Added new easy way of building TbaMUD in the Visual Studio through the CMake (#127)

* Added new experimental MSVC build way through CMake

* Small build/README.md fix

.gitignore

@@ -10,3 +10,6 @@ src/util/Makefile
 src/.accepted
 src/depend
 src/util/depend
+build/*
+!build/create_solution.bat
+!build/README.md

build/README.md

@@ -0,0 +1,15 @@
+### Overview
+This guide describes how to build TbaMUD in the Visual Studio through the new experimental CMake environment.
+
+### Prerequisites
+* [Visual Studio 2022+](https://visualstudio.microsoft.com/ru/vs/)
+* [CMake 3.27+](https://cmake.org/)
+
+### Build Steps
+1. Goto the folder `src` and copy `conf.h.win` to `conf.h`.
+
+2. Goto the folder `build` and execute `create_solution.bat`.
+
+3. Open `build/circle.sln` in Visual Studio.
+
+4. Compile and run.

build/create_solution.bat

@@ -0,0 +1 @@
+cmake -B . -S ..\src -G "Visual Studio 17 2022"

src/CMakeLists.txt

@@ -0,0 +1,26 @@
+cmake_minimum_required(VERSION 3.27)
+
+# Set the project name
+project(circle)
+
+# Global definitions
+if(MSVC)
+	# using Visual Studio C++
+	add_definitions(-D_CRT_SECURE_NO_WARNINGS -D_CRT_SECURE_NO_DEPRECATE -D_CRT_NONSTDC_NO_DEPRECATE)
+endif()
+
+# circle itself
+file(GLOB CIRCLE_SOURCES
+	"*.h"
+	"*.c"
+)
+
+add_executable(circle ${CIRCLE_SOURCES})
+
+if(MSVC)
+	target_link_libraries(circle wsock32.lib)
+	
+	set_target_properties(circle PROPERTIES
+		VS_DEBUGGER_WORKING_DIRECTORY "${CMAKE_SOURCE_DIR}/.."
+	)
+endif()

src/protocol.c

@@ -13,6 +13,11 @@
 #include <sys/types.h>
 #include "protocol.h"
 
+#ifdef _MSC_VER
+#include "telnet.h"
+#define alloca _alloca
+#endif
+
 /******************************************************************************
  The following section is for Diku/Merc derivatives.  Replace as needed.
  ******************************************************************************/