docs: add encrypted notes dapp to the list of examples in the root readme (#177)

Author: altkdf

README.md

@@ -48,3 +48,4 @@ Tools for frontend developers to interact with VetKD enabled canisters.
 - **[Basic Timelock IBE](examples/basic_timelock_ibe)** - Implements a secret-bid auction system where bids remain encrypted until a specified deadline.
 - **[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.