message: chore(otel): Add basic usage instructions to readme
diff: [![npm dm](https://img.shields.io/npm/dm/@sentry/opentelemetry-node.svg)](https://www.npmjs.com/package/@sentry/opentelemetry-node)
  [![npm dt](https://img.shields.io/npm/dt/@sentry/opentelemetry-node.svg)](https://www.npmjs.com/package/@sentry/opentelemetry-node)
  +## Installation
  +
  +```bash
  +npm install @sentry/node @sentry/opentelemetry-node
  +
  +# Or yarn
  +yarn add @sentry/node @sentry/opentelemetry-node
  +```
  +
  +Note that `@sentry/opentelemetry-node` depends on the following peer dependencies:
  +
  +* `@opentelemetry/api` version 1 or greater
  +* `@opentelemetry/sdk-trace-base` version 1 or greater, or a package that implements that, like `@opentelemetry/sdk-node`.
  +
  +## Usage
  +
  +You need to register the SentrySpanProcessor with your OpenTelemetry installation:
  +
  +```js
  +import * as Sentry from '@sentry/node';
  +import { SentrySpanProcessor } from '@sentry/opentelemetry-node';
  +
  +// Make sure to call this BEFORE setting up OpenTelemetry
  +Sentry.init({
  + dsn: '__DSN__',
  + // ...
  +});
  +
  +const sdk = new opentelemetry.NodeSDK({
  + // Existing config
  + traceExporter: new OTLPTraceExporter(),
  + instrumentations: [ getNodeAutoInstrumentations() ],
  +
  + // Sentry config
  + spanProcessor: new SentrySpanProcessor()
  +})
  +```
  +
  ## Links
  - [Official SDK Docs](https://docs.sentry.io/quickstart/)
  