chore: adds crosschain to navigation and index file

Author: stevedylandev

content/contracts/5.x/api/index.mdx

@@ -15,6 +15,9 @@ This API reference is automatically generated from the OpenZeppelin Contracts re
 - [ERC721](/contracts/5.x/api/token/ERC721) - Non-fungible token standard implementation
 - [ERC1155](/contracts/5.x/api/token/ERC1155) - Multi-token standard implementation
 
+### Crosschain
+- [ERC7786](/contracts/5.x/api/crosschain) - Contracts for sending and receiving cross chain messages that follows the ERC-7786 standard.
+
 ### Utilities
 - [Utils](/contracts/5.x/api/utils) - General utility functions and contracts
 - [Cryptography](/contracts/5.x/api/utils/cryptography) - Cryptographic utilities

src/navigation/ethereum-evm.json

@@ -186,6 +186,11 @@
 						"name": "Account",
 						"url": "/contracts/5.x/api/account"
 					},
+					{
+						"type": "page",
+						"name": "Crosschain",
+						"url": "/contracts/5.x/api/crosschain"
+					},
 					{
 						"type": "page",
 						"name": "Finance",