chore: add examples README.md (#1057)

examples/README.md

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+# OpenTelemetry JavaScript Examples
+
+This directory contains a number of examples of how to run real applications
+with OpenTelemetry JavaScript.
+
+### Maintained Examples
+
+Maintained Examples are expected to be updated with every OpenTelemetry JavaScript release, to
+use the latest and greatest features, and best practices.
+
+|Name | Description | Complexity Level |
+------------- | ------------- | ------------ |
+|[basic-tracer-node](basic-tracer-node/) | Basic use of Tracing in Node.js application | Beginner |
+|[tracer-node](tracer-node/) | Basic use of Tracing in Web application | Beginner |
+|[prometheus](prometheus/) | Basic Metric use with Prometheus (`@opentelemetry/exporter-prometheus`) Exporter | Beginner |
+|[http](http/)   | HTTP Instrumentation to automatically collect trace data and export them to the backend of choice | Intermediate |
+|[https](https/) | HTTPS Instrumentation to automatically collect trace data and export them to the backend of choice | Intermediate |
+|[grpc](grpc/)   | gRPC Instrumentation to automatically collect trace data and export them to the backend of choice | Intermediate |
+|[express](express/) | Express Instrumentation to automatically collect trace data and export them to the backend of choice | Intermediate |
+|[collector-exporter-node](collector-exporter-node/) | This example shows how to use `@opentelemetry/exporter-collector` to instrument a simple Node.js application | Intermediate |
+|[opentracing-shim](opentracing-shim/) | This is a simple example that demonstrates how existing OpenTracing instrumentation can be integrated with OpenTelemetry | Intermediate |
+
+### Contributing
+
+Please see [CONTRIBUTING.md](https://github.com/open-telemetry/opentelemetry-js/blob/master/CONTRIBUTING.md) for instructions on how to contribute.
+
+## LICENSE
+
+Apache License 2.0