First pass at instrumentation README

instrumentation/github.com/aws/aws-lambda-go/swolambda/README.md

@@ -0,0 +1,51 @@
+# Instrumentation for AWS Lambda
+
+This package instruments the AWS Lambda `Handler` interface. 
+
+## Usage
+
+### Add the `Otelcol` extension layer
+
+Follow the [SolarWinds Observability 
+documentation](https://documentation.solarwinds.com/en/success_center/observability/content/intro/services/aws-lambda-overview.htm) 
+to add the Otelcol extension layer. 
+
+**Note**: Unlike other languages, Golang does not require an additional 
+extension, so the "Instrumentation extension" section on that page does not 
+apply.
+
+### Modify your code
+
+First, install the dependency:
+```shell
+go get -u github.com/solarwinds/apm-go/instrumentation/github.com/aws/aws-lambda-go/swolambda
+```
+
+Then, wrap your handler with `swolambda.WrapHandler`:
+
+```go
+package main
+import (
+	"context"
+	"github.com/aws/aws-lambda-go/lambda"
+	"github.com/solarwinds/apm-go/instrumentation/github.com/aws/aws-lambda-go/swolambda"
+)
+
+// Example incoming type
+type MyEvent struct {}
+
+// This is an example handler, yours may have a different signature and a 
+// different name. It will work ass long as it adheres to what the Lambda SDK
+// expects. (See "Valid handler signatures"[0])
+// [0] https://docs.aws.amazon.com/lambda/latest/dg/golang-handler.html
+func ExampleHandler(ctx context.Context, event *MyEvent) (string, error) {
+	return "hello world", nil
+}
+func main() {
+	// We wrap our handler here and pass the result to `lambda.Start`
+	lambda.Start(swolambda.WrapHandler(ExampleHandler))
+}
+```
+
+Now that you've instrumented your code, you should be able to send requests and
+see the resulting metrics and traces in SWO.