Vendor dependencies for 0.3.0 release

vendor/windows-strings-0.1.0/readme.md

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+## Windows string types
+
+The [windows-strings](https://crates.io/crates/windows-strings) crate provides common Windows string types used by various Windows APIs.
+
+* [Getting started](https://kennykerr.ca/rust-getting-started/)
+* [Samples](https://github.com/microsoft/windows-rs/tree/0.58.0/crates/samples)
+* [Releases](https://github.com/microsoft/windows-rs/releases)
+
+Start by adding the following to your Cargo.toml file:
+
+```toml
+[dependencies.windows-strings]
+version = "0.1"
+```
+
+Use the Windows string types as needed:
+
+```rust
+use windows_strings::*;
+
+const A: PCSTR = s!("ansi");
+const W: PCWSTR = w!("wide");
+
+fn main() -> Result<()> {
+    let b = BSTR::from("bstr");
+    let h = HSTRING::from("hstring");
+
+    assert_eq!(b, "bstr");
+    assert_eq!(h, "hstring");
+
+    assert_eq!(unsafe { A.to_string()? }, "ansi");
+    assert_eq!(unsafe { W.to_string()? }, "wide");
+
+    Ok(())
+}
+```