docs: README for sunset (#147)

Co-authored-by: Anna Pobletts <anna.pobletts@agilebits.com>

Author: apobletts

README.md

@@ -3,6 +3,9 @@
 [![PyPI version](https://badge.fury.io/py/passage-identity.svg)](https://badge.fury.io/py/passage-identity) [![Python](https://img.shields.io/badge/Python-3776AB?logo=python&logoColor=fff)](#) ![GitHub License](https://img.shields.io/github/license/passageidentity/passage-python)
 ![Static Badge](https://img.shields.io/badge/Built_by_1Password-grey?logo=1password)
 
+# ⚠️ DEPRECATED
+**This repository is deprecated and no longer maintained as of January 16, 2026.**
+
 ## About
 
 [Passage by 1Password](https://1password.com/product/passage) unlocks the passwordless future with a simpler, more secure passkey authentication experience. Passage handles the complexities of the [WebAuthn API](https://blog.1password.com/what-is-webauthn/), and allows you to implement passkeys with ease.