add readme

e2e/readme.md

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+# E2E Tests
+
+## Accessibility
+
+TBD
+
+## Screenshot Testing
+
+Screenshot testing uses [playwright](https://playwright.dev/) and [component testing](https://playwright.dev/docs/test-components) to capture screenshots of components in different states for both light and dark themes.
+
+To update existing snapshots run:
+
+```sh
+npm run screenshots --update-screenshots
+```
+
+To run tests run:
+
+```sh
+yarn screenshots
+```