Add screenshot to usage

Author: nickserv

README.md

@@ -15,6 +15,10 @@ Testing Library Extension for Chrome DevTools Recorder
 1. Create a new recording via the Recorder panel.
 2. Hover over the export icon
 3. Click `Export as a Testing Library script`
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+![Screenshot](https://user-images.githubusercontent.com/927220/185593628-0beda94a-ec08-40a5-9c93-cf9ecb70527e.png)
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 4. Save file as `{testName}.test.{ts,js}`
 5. Install `jest`, `jest-environment-jsdom`, and `jest-environment-url`
 6. Run tests with `jest`