Add basic CMake project

.gitignore

@@ -1 +1,2 @@
 .vs/
+build/

CMakeLists.txt

@@ -0,0 +1,5 @@
+# Mainspring CMakeLists.txt
+
+cmake_minimum_required(VERSION 3.20)
+
+project(mainspring)

CMakePresets.json

@@ -0,0 +1,50 @@
+// Mainspring CMake presets
+
+{
+  "version": 3,
+
+  "configurePresets": [
+    {
+      "name": "base",
+      "hidden": true,
+      "generator": "Ninja",
+      "binaryDir": "${sourceDir}/build/${presetName}",
+      "architecture": {
+        "value": "x64",
+        "strategy": "external"
+      },
+      "cacheVariables": {
+        "CMAKE_C_COMPILER": "cl.exe",
+        "CMAKE_CXX_COMPILER": "cl.exe"
+      }
+    },
+
+    {
+      "name": "Debug",
+      "inherits": "base",
+      "cacheVariables": {
+        "CMAKE_BUILD_TYPE": "Debug"
+      }
+    },
+
+    {
+      "name": "Release",
+      "inherits": "base",
+      "cacheVariables": {
+        "CMAKE_BUILD_TYPE": "Release"
+      }
+    }
+  ],
+
+  "buildPresets": [
+    {
+      "name": "Debug",
+      "configurePreset": "Debug"
+    },
+
+    {
+      "name": "Release",
+      "configurePreset": "Release"
+    }
+  ]
+}