Add third-party software notices (#1)

Author: smnandre

NOTICE

@@ -0,0 +1,7 @@
+THIRD-PARTY SOFTWARE NOTICES AND INFORMATION
+
+This project depends on Playwright, an open-source project by Microsoft,
+available at https://github.com/microsoft/playwright and licensed under
+the Apache License 2.0 (https://github.com/microsoft/playwright/blob/main/LICENSE).
+"Playwright" is a trademark of Microsoft. This project is independent and not
+affiliated with or endorsed by Microsoft.