Add AccessManager guide (#4691)

Co-authored-by: Hadrien Croubois <hadrien.croubois@gmail.com>
Co-authored-by: Eric Lau <ericglau@outlook.com>
Co-authored-by: Zack Reneau-Wedeen <z.reneau.wedeen@gmail.com>

contracts/mocks/docs/access-control/AccessControlERC20MintBase.sol

@@ -0,0 +1,25 @@
+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.20;
+
+import {AccessControl} from "../../../access/AccessControl.sol";
+import {ERC20} from "../../../token/ERC20/ERC20.sol";
+
+contract AccessControlERC20MintBase is ERC20, AccessControl {
+    // Create a new role identifier for the minter role
+    bytes32 public constant MINTER_ROLE = keccak256("MINTER_ROLE");
+
+    error CallerNotMinter(address caller);
+
+    constructor(address minter) ERC20("MyToken", "TKN") {
+        // Grant the minter role to a specified account
+        _grantRole(MINTER_ROLE, minter);
+    }
+
+    function mint(address to, uint256 amount) public {
+        // Check that the calling account has the minter role
+        if (!hasRole(MINTER_ROLE, msg.sender)) {
+            revert CallerNotMinter(msg.sender);
+        }
+        _mint(to, amount);
+    }
+}