Update readme

README.md

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-# ERC-4626 Reference Implementations • [![CI](https://github.com/transmissions11/foundry-template/actions/workflows/tests.yml/badge.svg)](https://github.com/transmissions11/foundry-template/actions/workflows/tests.yml)
+# ERC-7540 Reference Implementations • [![CI](https://github.com/transmissions11/foundry-template/actions/workflows/tests.yml/badge.svg)](https://github.com/transmissions11/foundry-template/actions/workflows/tests.yml)
+
+Reference implementations for [ERC-7540](https://eips.ethereum.org/EIPS/eip-7540).
+
+[**Controlled Async Deposits**](https://github.com/ERC4626-Alliance/ERC-7540-Reference/blob/main/src/ControlledAsyncDeposits.sol) reference:
+  - yield for the underlying asset is assumed to be transferred directly into the vault by some arbitrary mechanism
+  - async deposits are subject to approval by an owner account
+  - users can only deposit the maximum amount.
+  To allow partial claims, the deposit and mint functions would need to allow for pro rata claims.
+  Conversions between claimable assets/shares should be checked for rounding safety.
 
-Includes sample reference implementations for [ERC-7540](https://ethereum-magicians.org/t/eip-7540-asynchronous-erc-4626-tokenized-vaults/16153) async deposit and withdraw for different use cases.