first commit, on the way to implement window drawing

.gitignore

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+/build/*
+!/build/.gitk

code/.clangd

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+CompileFlags:
+  Add:
+    - "--target=x86_64-w64-windows-gnu"
+    - "-isystem"
+    - "/usr/lib/zig/libc/include/any-windows-any"
+    - "-isystem"
+    - "/usr/lib/zig/libc/include/generic-musl"
+    - "-D_WIN32"
+    - "-D_X86_64_"

code/Makefile

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+comp:
+	zig c++ --target=x86_64-windows -o ../build/win32_handmade.exe win32_handmade.cpp
+.PHONY: clean
+clean: 
+	rm ../build/*

code/win32_handmade.cpp

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+#include <windows.h>
+
+int CALLBACK WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
+                     LPSTR lpCmdLine, int nCmdShow) {
+  WNDCLASS WindowClass = {0};
+  WindowClass.style = ;
+  WindowClass.lpfnWndProc = ;
+  // WindowClass.cbClsExtra = ;
+  // WindowClass.cbWndExtra = ;
+  WindowClass.hInstance = hInstance;
+  // WindowClass.hIcon = ;
+  // WindowClass.hCursor = ;
+  // WindowClass.lpszMenuName = ;
+  WindowClass.lpszClassName = "HandmadeHeroWindowClass";
+  return (0);
+}