docs: update README

Adds `xray-lite-aws-sdk/README.md`.

Introduces `xray-lite-aws-sdk` in `README.md`.
Bumps the version in the installation instruction to v0.0.7.

README.md

@@ -2,19 +2,21 @@
 
 > [AWS X-Ray](https://aws.amazon.com/xray/) daemon client for Rust applications on [AWS Lambda](https://aws.amazon.com/lambda/)
 
-## Installing
+## Installing `xray-lite`
 
 Add the following to your `Cargo.toml` file:
 
 ```toml
 [dependencies]
-xray-lite = { git = "https://github.com/codemonger-io/xray-lite.git", tag = "v0.0.6" }
+xray-lite = { git = "https://github.com/codemonger-io/xray-lite.git", tag = "v0.0.7" }
 ```
 
 ## Usage
 
 ### Subsegment of AWS service operation
 
+**The [`xray-lite-aws-sdk`](./xray-lite-aws-sdk) extension is recommended for tracing requests through [AWS SDK for Rust](https://aws.amazon.com/sdk-for-rust/).**
+
 Here is an example to record a subsegment of an AWS service operation within a Lambda function invocation instrumented with AWS X-Ray:
 
 ```rust
@@ -106,9 +108,14 @@ fn do_something(context: &impl Context) {
 }
 ```
 
+## Extensions
+
+- [`xray-lite-aws-sdk`](./xray-lite-aws-sdk/): extension for [AWS SDK for Rust](https://aws.amazon.com/sdk-for-rust/)
+
 ## API Documentation
 
-<https://codemonger-io.github.io/xray-lite/api/xray_lite/>
+- [`xray-lite`](https://codemonger-io.github.io/xray-lite/api/xray_lite/)
+- [`xray-lite-aws-sdk`](https://codemonger-io.github.io/xray-lite/api/xray_lite_aws_sdk/)
 
 ## Acknowledgements
 

xray-lite-aws-sdk/README.md

@@ -0,0 +1,46 @@
+# `xray-lite-aws-sdk`
+
+`xray-lite-aws-sdk` is an extension of [`xray-lite`](../) for [AWS SDK for Rust](https://aws.amazon.com/sdk-for-rust/).
+
+## Installing `xray-lite-aws-sdk`
+
+Add the following to your `Cargo.toml` file:
+
+```toml
+[dependencies]
+xray-lite-aws-sdk = { git = "https://github.com/codemonger-io/xray-lite.git", tag = "aws-sdk-v0.0.1" }
+```
+
+## Usage
+
+With this crate, you can easily add the X-Ray tracing capability to your AWS service requests through [AWS SDK for Rust](https://aws.amazon.com/sdk-for-rust/).
+It utilizes the [interceptor](https://docs.rs/aws-smithy-runtime-api/latest/aws_smithy_runtime_api/client/interceptors/trait.Intercept.html) which can be attached to `CustomizableOperation` available via the `customize` method of any request builder; e.g., [`aws_sdk_s3::operation::get_object::builders::GetObjectFluentBuilder::customize`](https://docs.rs/aws-sdk-s3/latest/aws_sdk_s3/operation/get_object/builders/struct.GetObjectFluentBuilder.html#method.customize)
+
+The following example shows how to report a subsegment for each attempt of the S3 GetObject operation:
+
+```rust
+use aws_config::BehaviorVersion;
+use xray_lite::{Client, SubsegmentContext};
+use xray_lite_aws_sdk::ContextExt as _;
+
+async fn get_object_from_s3() {
+    let xray_client = Client::from_lambda_env().unwrap();
+    let xray_context = SubsegmentContext::from_lambda_env(xray_client).unwrap();
+
+    let config = aws_config::load_defaults(BehaviorVersion::latest()).await;
+    let s3_client = aws_sdk_s3::Client::new(&config);
+    s3_client
+        .get_object()
+        .bucket("the-bucket-name")
+        .key("the-object-key")
+        .customize()
+        .interceptor(xray_context.intercept_operation("S3", "GetObject"))
+        .send()
+        .await
+        .unwrap();
+}
+```
+
+## API Documentation
+
+<https://codemonger-io.github.io/xray-lite/api/xray_lite_aws_sdk/>