Update README.md (#60)

Add go package documentation link.
Add all import paths to example usage.

README.md

@@ -1,11 +1,28 @@
 # opentelemetry-proto-go
 
-Generated code for OpenTelemetry protobuf data model
+[![Go Reference](https://pkg.go.dev/badge/go.opentelemetry.io/proto/otlp.svg)](https://pkg.go.dev/go.opentelemetry.io/proto/otlp)
 
-## Usage
+Generated Go code for the OpenTelemetry protobuf data model.
 
-You can import the generated code directly in your project
+## Getting Started
+
+Install the latest version in your project.
+
+```sh
+go get go.opentelemetry.io/proto/otlp@latest
+```
+
+Import the generated code directly in your project.
 
 ```go
-import tracepb "go.opentelemetry.io/proto/otlp/trace/v1"
+import (
+	collogspb "go.opentelemetry.io/proto/otlp/collector/logs/v1"
+	colmetricspb "go.opentelemetry.io/proto/otlp/collector/metrics/v1"
+	coltracepb "go.opentelemetry.io/proto/otlp/collector/trace/v1"
+	commonpb "go.opentelemetry.io/proto/otlp/common/v1"
+	logspb "go.opentelemetry.io/proto/otlp/logs/v1"
+	metricspb "go.opentelemetry.io/proto/otlp/metrics/v1"
+	resourcepb "go.opentelemetry.io/proto/otlp/resource/v1"
+	tracepb "go.opentelemetry.io/proto/otlp/trace/v1"
+)
 ```