Support cmake (#153)

* First cmake list file, simple docs.

TODO: utils folder.

* Support for building utils

* All fields except HAVE_DOPRNT in place

* Now builds and runs :)

doc/README.CMAKE.md

@@ -0,0 +1,93 @@
+Updated 2025-04
+
+## Building TbaMUD with the cmake tool
+
+# Building with CMake
+
+This document describes how to configure, build and install tbamud
+from source code using the CMake build tool. To build with CMake, you of
+course first have to install CMake. The minimum required version of CMake is
+specified in the file `CMakeLists.txt` found in the top of the tbamud source
+tree. Once the correct version of CMake is installed you can follow the
+instructions below for the platform you are building on.
+
+CMake builds can be configured either from the command line, or from one of
+CMake's GUIs. 
+
+NOTE: The current CMakeLists.txt only supports linux.
+
+# Configuring
+
+A CMake configuration of tbamud is similar to the autotools build of curl.
+It consists of the following steps after you have unpacked the source.
+
+We recommend building with CMake on Windows. 
+
+## Using `cmake`
+
+You can configure for in source tree builds or for a build tree
+that is apart from the source tree.
+
+- Build in a separate directory (parallel to the source tree in this
+  example). The build directory is created for you. This is recommended over
+  building in the source tree to separate source and build artifacts.
+
+```shell
+$ cmake -B build -S .
+```
+
+- Build in the source tree. Not recommended.
+
+```shell
+$ cmake -B .
+```
+
+The examples below will assume you have created a build folder.
+
+The above commands will generate the build files. If you need to regenerate
+the files, you can delete the cmake cache file, and rerun the above command:
+
+```shell
+$ rm build/CMakeCache.txt
+```
+
+Once the build files are generated, the build is run with cmake
+
+```shell
+$ cmake --build build
+```
+
+This will generate the object files in a subdirectory under the specified
+build folder and link the executable. The resulting binaries will be in the
+bin/ folder.
+
+### Utilities
+
+It is possible to build only single tools, none or all of them,
+by specifying the target in the build command:
+
+```shell
+# only build the mud
+$ cmake --build build --target circle
+
+# only build tools
+$ cmake --build build --target utils
+
+# only build one tool
+$ cmake --build build --target wld2html
+```
+
+### Debugging memory
+
+In case you want to run the mud with memory debugging turned on, you
+can set the MEMORY_DEBUG flag during configuration by specifying the 
+flag:
+
+```shell
+$ cmake -B build -S . -DMEMORY_DEBUG:int=1
+$ cmake --build build
+```
+
+When the mud is shut down, the zmalloc code will identify any leaks in your code.
+Note that memory debugging may consume quite a lot of memory and take some time
+to be handled on shutdown.

doc/README.MSVC2022

@@ -0,0 +1,21 @@
+Updated: Apr 2025
+                 Compiling CircleMUD under Microsoft Windows XP
+                     using Microsoft Visual C++ 2022 (8.0)
+
+### 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. Run this command in the root folder:
+
+    cmake -B build -S . -G "Visual Studio 17 2022"
+
+3. Open `build/circle.sln` in Visual Studio.
+
+4. Compile and run.