Add no-std example.

no_std/no_std_win/README.md

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+`no-std` Sample for Windows API
+==============================
+
+This sample application is a bare-bones `no-std` build for the Windows API.
+
+[`wee_alloc`](https://crates.io/crates/wee_alloc) is used as the allocator.
+
+
+To Compile
+----------
+
+The nightly compiler is required:
+
+```bash
+cargo +nightly build --release
+```
+
+The release build is optimized for size.  It can be changed to optimize on speed instead.