List encryted chat as example app in vetKeys repo README

Author: fspreiss

README.md

@@ -49,3 +49,4 @@ Tools for frontend developers to interact with VetKD enabled canisters.
 - **[Password Manager](examples/password_manager)** - A secure, decentralized password manager using Encrypted Maps for vault-based password storage and sharing.
 - **[Password Manager with Metadata](examples/password_manager_with_metadata)** - Extends the basic password manager to support unencrypted metadata alongside encrypted passwords.
 - **[Encrypted Notes](examples/encrypted_notes_dapp_vetkd)** - A secure note-taking application that uses vetKeys for encryption and enables sharing notes between users without device management.
+- **[Encrypted Chat](examples/encrypted_chat)** - An *unfinished prototype* for an end-to-end encrypted messaging application based on vetKeys.