Add README to openapi-lambda-codegen

Author: ramosbugs

openapi-lambda-codegen/README.md

@@ -0,0 +1,5 @@
+This crate provides the code generator for the
+[`openapi-lambda`](https://crates.io/crates/openapi-lambda) crate.
+
+Please refer to the `openapi-lambda`
+[crate documentation](https://docs.rs/openapi-lambda) for usage information.

openapi-lambda-codegen/src/lib.rs

@@ -1,11 +1,7 @@
+#![doc = include_str!("../README.md")]
 #![allow(clippy::too_many_arguments)]
 #![warn(missing_docs)]
 
-//! Code generator for [`openapi-lambda`](https://docs.rs/openapi-lambda) crate.
-//!
-//! Please refer to the [`openapi-lambda`](https://docs.rs/openapi-lambda) crate documentation for
-//! usage information.
-
 use crate::api::operation::collect_operations;
 
 use indexmap::IndexMap;