Add clippy_utils README.md file for publishing

Author: flip1995

clippy_utils/Cargo.toml

@@ -4,6 +4,7 @@ version = "0.1.84"
 edition = "2021"
 description = "Helpful tools for writing lints, provided as they are used in Clippy"
 repository = "https://github.com/rust-lang/rust-clippy"
+readme = "README.md"
 license = "MIT OR Apache-2.0"
 keywords = ["clippy", "lint", "utils"]
 categories = ["development-tools"]

clippy_utils/README.md

@@ -0,0 +1,38 @@
+# `clippy-utils`
+
+<!-- begin autogenerated nightly -->
+```
+nightly-2024-11-14
+```
+<!-- end autogenerated nightly -->
+
+Helpful tools for writing lints, provided as they are used in Clippy.
+
+## Usage
+
+This crate is only guaranteed to build with the `nightly` toolchain above.
+
+```
+clippy_utils = "0.1.XY"
+```
+
+`XY` is the version of the nightly toolchain above and can be determined with `rustc +nightly-YYYY-MM-DD -V`.
+
+## :warning: Stability :warning:
+
+No stability guarantees are made for this crate! Use at your own risk.
+
+Function signatures can change or be removed without replacement without any prior notice.
+
+## LICENSE
+
+<!-- REUSE-IgnoreStart -->
+
+Copyright 2014-2024 The Rust Project Developers
+
+Licensed under the Apache License, Version 2.0
+<[https://www.apache.org/licenses/LICENSE-2.0](https://www.apache.org/licenses/LICENSE-2.0)> or the MIT license
+<[https://opensource.org/licenses/MIT](https://opensource.org/licenses/MIT)>, at your option. Files in the project may
+not be copied, modified, or distributed except according to those terms.
+
+<!-- REUSE-IgnoreEnd -->