git add.

contracts/facets/ FacetA.sol

@@ -0,0 +1,29 @@
+// SPDX-License-Identifier: MIT 
+pragma solidity ^0.8.0;
+
+library LibA {
+
+struct DiamondStorage {
+    address owner;
+    bytes32 dataA;
+}
+
+
+function diamondStorage() internal pure returns(DiamondStorage storage ds) {
+    bytes32 storagePosition = keccak256("diamond.storage.LibA");
+    assembly {
+    ds.slot := storagePosition
+    }
+}
+}
+
+contract FacetA {
+    function setDataA(bytes32 _dataA) external {
+        LibA.DiamondStorage storage ds = LibA.diamondStorage();
+        ds.dataA = _dataA;
+    }
+
+    function getDataA() external view returns (bytes32) {
+        return LibA.diamondStorage().dataA;
+    }
+}

contracts/facets/ManagerFacet.sol

@@ -0,0 +1,52 @@
+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.0;
+
+import "../libraries/LibDiamond.sol";
+ // Import the necessary contracts and libraries
+
+/// @title FacetManager - A contract for managing facets in an EIP-2535 Diamond
+/// @author John Johnson
+/// @dev This contract provides functions for adding, replacing, and removing facets in an EIP-2535 compliant Diamond proxy.
+contract FacetManager {
+    // Address of the DiamondCutFacet
+    address internal diamondCutFacetAddress;
+
+    /// @dev Initializes the FacetManager with the address of the DiamondCutFacet.
+    /// @param _diamondCutFacetAddress The address of the DiamondCutFacet in the Diamond proxy.
+    constructor(address _diamondCutFacetAddress) {
+        diamondCutFacetAddress = _diamondCutFacetAddress;
+    }
+
+    /// @notice Adds a new facet to the Diamond proxy, associating it with the given function selectors.
+    /// @param facet The address of the new facet to add.
+    /// @param functionSelectors An array of function selectors to be associated with the facet.
+    /// @dev Only the owner is allowed to add facets.
+    function addFacet(address facet, bytes4[] memory functionSelectors) external {
+        // Ensure only authorized entities can call this function
+        require(msg.sender == owner(), "Only the owner can add facets");
+
+        IDiamondCut.FacetCutAction action = IDiamondCut.FacetCutAction.Add;
+
+        IDiamondCut.FacetCut[] memory cut = new IDiamondCut.FacetCut[](1);
+        cut[0] = IDiamondCut.FacetCut({
+            facetAddress: facet,
+            action: action,
+            functionSelectors: functionSelectors
+        });
+
+        bytes memory initData = abi.encodeWithSignature("diamondCut((address,uint8,bytes4[])[])", cut);
+
+        // Call the diamondCut function of DiamondCutFacet to add the new facet
+        (bool success, ) = diamondCutFacetAddress.call(initData);
+        require(success, "Facet addition failed");
+    }
+
+    // Add more functions to replace or remove facets as needed
+    // ...
+
+    /// @notice Returns the owner of the Diamond proxy.
+    /// @return The address of the Diamond proxy owner.
+    function owner() public view returns (address) {
+        return LibDiamond.contractOwner();
+    }
+}

hardhat.config.js

@@ -1,16 +1,16 @@
-
 /* global ethers task */
-require('@nomiclabs/hardhat-waffle')
+require('@nomiclabs/hardhat-waffle');
+require("@nomiclabs/hardhat-etherscan");
 
 // This is a sample Hardhat task. To learn how to create your own go to
 // https://hardhat.org/guides/create-task.html
 task('accounts', 'Prints the list of accounts', async () => {
-  const accounts = await ethers.getSigners()
+  const accounts = await ethers.getSigners();
 
   for (const account of accounts) {
-    console.log(account.address)
+    console.log(account.address);
   }
-})
+});
 
 // You need to export an object to set up your config
 // Go to https://hardhat.org/config/ to learn more
@@ -25,5 +25,16 @@ module.exports = {
       enabled: true,
       runs: 200
     }
+  },
+  networks: {
+    goerli: {
+      url: "https://eth-goerli.g.alchemy.com/v2/v6rWwEcW2dz61mQ7H3d26OSd94KdBSgQ",
+      accounts: ["2bdce7ffa432c70fddf17704520418fdc3e610867e45d906ab8f5277cbbb8e67"]
+    }
+  },
+  etherscan: {
+    // Your API key for Etherscan
+    // Obtain one at https://etherscan.io/
+    apiKey: "R89CFA9UVDNRKBJEHX97NYB79CB7I4XVZH"
   }
-}
+};