message: update react plugin readme
diff: @@ -48,6 +48,22 @@ class MyComponent extends React.Component {
  export default withAITracking(reactPlugin, MyComponent);
  ```
  +For `react-router v6` or other scenarios where router history is not exposed, appInsights config `enableAutoRouteTracking` can be used to auto track router changes.
  +
  +```js
  +var reactPlugin = new ReactPlugin();
  +var appInsights = new ApplicationInsights({
  + config: {
  + instrumentationKey: 'YOUR_INSTRUMENTATION_KEY_GOES_HERE',
  + enableAutoRouteTracking: true,
  + extensions: [reactPlugin]
  + }
  + }
  +});
  +appInsights.loadAppInsights();
  +```
  +
  +
  ## Configuration
  