add deploy bsc

screencast/345-deploy-smart-contract-bsc/contracts/ContractA.sol

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+pragma solidity ^0.8.4;
+
+contract ContractA {
+  address public admin ;
+
+  constructor(address _admin) {
+    admin = _admin;
+  }
+}

screencast/345-deploy-smart-contract-bsc/contracts/ContractB.sol

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+pragma solidity ^0.8.4;
+
+contract ContractB {
+  address public admin ;
+  address public contractB;
+
+  constructor(address _admin, address _contractB) {
+    admin = _admin;
+    contractB = _contractB;
+  }
+}

screencast/345-deploy-smart-contract-bsc/contracts/Migrations.sol

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+// SPDX-License-Identifier: MIT
+pragma solidity >=0.4.22 <0.9.0;
+
+contract Migrations {
+  address public owner = msg.sender;
+  uint public last_completed_migration;
+
+  modifier restricted() {
+    require(
+      msg.sender == owner,
+      "This function is restricted to the contract's owner"
+    );
+    _;
+  }
+
+  function setCompleted(uint completed) public restricted {
+    last_completed_migration = completed;
+  }
+}

screencast/345-deploy-smart-contract-bsc/migrations/1_initial_migration.js

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+const Migrations = artifacts.require("Migrations");
+
+module.exports = function (deployer) {
+  deployer.deploy(Migrations);
+};

screencast/345-deploy-smart-contract-bsc/migrations/2_deploy_contracts.js

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+const ContractA = artifacts.require('ContractA.sol');
+const ContractB = artifacts.require('ContractB.sol');
+
+module.exports = async function (deployer, network, accounts) {
+  const [admin, _] = accounts;
+
+  if(network === 'bscTestnet' || network === 'develop') {
+    await deployer.deploy(ContractA, admin);
+    const contractA = await ContractA.deployed();
+    deployer.deploy(ContractB, admin, contractA.address);
+  }
+
+  if(network === 'bsc') {
+    //Deployment logic for mainnet
+  }
+};