Rust: Create README.md for Lambda Function example

rustv1/examples/lambda/README.md

@@ -5,6 +5,7 @@
 Shows how to use the AWS SDK for Rust to work with AWS Lambda.
 
 <!--custom.overview.start-->
+For an example of using Rust in a lambda function, see [this example](../../lambda).
 <!--custom.overview.end-->
 
 _Lambda allows you to run code without provisioning or managing servers._

rustv1/lambda/README.md

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+# Rust Lambda Function
+
+## Overview
+
+This example shows how to use Rust in a lambda function.
+_Lambda allows you to run code without provisioning or managing servers._
+
+## ⚠ Important
+
+* Running this code might result in charges to your AWS account. For more details, see [AWS Pricing](https://aws.amazon.com/pricing/) and [Free Tier](https://aws.amazon.com/free/).
+* Running the tests might result in charges to your AWS account.
+* We recommend that you grant your code least privilege. At most, grant only the minimum permissions required to perform the task. For more information, see [Grant least privilege](https://docs.aws.amazon.com/IAM/latest/UserGuide/best-practices.html#grant-least-privilege).
+* This code is not tested in every AWS Region. For more information, see [AWS Regional Services](https://aws.amazon.com/about-aws/global-infrastructure/regional-product-services).
+
+<!--custom.important.start-->
+<!--custom.important.end-->
+
+## Code examples
+
+### Prerequisites
+
+For prerequisites, see the [README](../../README.md#Prerequisites) in the `rustv1` folder.
+
+
+<!--custom.prerequisites.start-->
+
+Additionally, to compile Lambda functions written in the Rust programming language, use [Cargo Lambda](https://www.cargo-lambda.info/).
+
+<!--custom.prerequisites.end-->
+
+
+### Tests
+
+⚠ Running tests might result in charges to your AWS account.
+
+
+To find instructions for running these tests, see the [README](../../README.md#Tests)
+in the `rustv1` folder.
+
+
+
+<!--custom.tests.start-->
+<!--custom.tests.end-->
+
+## Additional resources
+
+- [Lambda Developer Guide](https://docs.aws.amazon.com/lambda/latest/dg/welcome.html)
+- [Lambda API Reference](https://docs.aws.amazon.com/lambda/latest/dg/API_Reference.html)
+<!--custom.resources.start-->
+- [Cargo Lambda](https://cargo-lambda.info)
+<!--custom.resources.end-->
+
+---
+
+Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+
+SPDX-License-Identifier: Apache-2.0