Update README to include SignerZKEmail and ZKEmailUtils documentation

Author: ernestognw

contracts/utils/README.adoc

@@ -9,7 +9,9 @@ Miscellaneous contracts and libraries containing utility functions you can use t
  * {ERC7739}: An abstract contract to validate signatures following the rehashing scheme from `ERC7739Utils`.
  * {ERC7739Utils}: Utilities library that implements a defensive rehashing mechanism to prevent replayability of smart contract signatures based on ERC-7739.
  * {SignerECDSA}, {SignerP256}, {SignerRSA}: Implementations of an {AbstractSigner} with specific signature validation algorithms.
+ * {SignerZKEmail}: Implementation of an {AbstractSigner} that enables email-based authentication through zero-knowledge proofs.
  * {Masks}: Library to handle `bytes32` masks.
+ * {ZKEmailUtils}: Library for ZKEmail signature validation utilities, enabling email-based authentication through zero-knowledge proofs.
 
 == Cryptography
 
@@ -25,6 +27,10 @@ Miscellaneous contracts and libraries containing utility functions you can use t
 
 {{SignerRSA}}
 
+{{SignerZKEmail}}
+
+{{ZKEmailUtils}}
+
 == Libraries
 
 {{Masks}}