docs(nodejs): improve nodejs doc

Author: pragmaticivan

nodejs/README.md

@@ -8,6 +8,19 @@ To use, add the layer to your function configuration and then set `AWS_LAMBDA_EX
 [AWS SDK v2 instrumentation](https://github.com/aspecto-io/opentelemetry-ext-js/tree/master/packages/instrumentation-aws-sdk) is also
 included and loaded automatically if you use the AWS SDK v2.
 
+## Supported Runtimes
+
+| Platform Version    | Supported                                     |
+| ------------------- | --------------------------------------------- |
+| `nodejs22.x`        | :heavy_check_mark:                            |
+| `nodejs20.x`        | :heavy_check_mark:                            |
+| `nodejs18.x`        | :heavy_check_mark:                            |
+| Older Node Versions | See [Node Support](#node-support)             |
+
+### Node Support
+
+Only Node.js Active or Maintenance LTS versions are supported.
+
 ## Building
 
 To build the layer and sample applications in this `nodejs` folder:
@@ -32,4 +45,4 @@ Sample applications are provided to show usage of the above layer.
 
 - Application using AWS SDK - shows using the wrapper with an application using AWS SDK without code change.
   - [Using layer built from source](./integration-tests/aws-sdk)
-  - [WIP] [Using OTel Public Layer](./sample-apps/aws-sdk) 
+  - [WIP] [Using OTel Public Layer](./sample-apps/aws-sdk)