chore: checkpoint before Python removal

vendor/windows-sys/readme.md

@@ -0,0 +1,42 @@
+## windows-sys
+
+The `windows-sys` crate is a zero-overhead fallback for the most demanding situations and primarily where the absolute best compile time is essential. It only includes function declarations (externs), structs, and constants. No convenience helpers, traits, or wrappers are provided.
+
+- [Getting started](https://kennykerr.ca/rust-getting-started/)
+- [Samples](https://github.com/microsoft/windows-rs/tree/master/crates/samples)
+- [Releases](https://github.com/microsoft/windows-rs/releases)
+- [Feature search](https://microsoft.github.io/windows-rs/features)
+
+Start by adding the following to your Cargo.toml file:
+
+```toml
+[dependencies.windows-sys]
+version = ">=0.59, <=0.61"
+features = [
+    "Win32_Security",
+    "Win32_System_Threading",
+    "Win32_UI_WindowsAndMessaging",
+]
+```
+
+Using a range instead of the [default Caret requirements](https://doc.rust-lang.org/cargo/reference/specifying-dependencies.html#caret-requirements) helps avoid duplicate versions in downstream graphs and improves resolver flexibility.
+
+Make use of any Windows APIs as needed:
+
+```rust,no_run
+use windows_sys::{
+    core::*, Win32::Foundation::*, Win32::System::Threading::*, Win32::UI::WindowsAndMessaging::*,
+};
+
+unsafe {
+    let event = CreateEventW(std::ptr::null(), 1, 0, std::ptr::null());
+    SetEvent(event);
+    WaitForSingleObject(event, 0);
+    CloseHandle(event);
+
+    MessageBoxA(0 as _, s!("Ansi"), s!("Caption"), MB_OK);
+    MessageBoxW(0 as _, w!("Wide"), w!("Caption"), MB_OK);
+}
+```
+
+