Create NexusToken.sol

pi-nexus-blockchain/contracts/NexusToken.sol

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+pragma solidity ^0.8.0;
+
+import "https://github.com/OpenZeppelin/openzeppelin-solidity/contracts/token/ERC20/SafeERC20.sol";
+
+contract NexusToken is ERC20 {
+    address private _owner;
+    uint256 private _totalSupply;
+
+    constructor() public {
+        _owner = msg.sender;
+        _totalSupply = 1000000 * (10 ** 18); // 1 million tokens with 18 decimals
+        _mint(_owner, _totalSupply);
+    }
+
+    function transfer(address recipient, uint256 amount) public override {
+        require(recipient != address(0), "Cannot transfer to zero address");
+        _transfer(msg.sender, recipient, amount);
+    }
+
+    function _transfer(address sender, address recipient, uint256 amount) internal {
+        require(sender != address(0), "Cannot transfer from zero address");
+        require(recipient != address(0), "Cannot transfer to zero address");
+        _balances[sender] = _balances[sender].sub(amount, "Insufficient balance");
+        _balances[recipient] = _balances[recipient].add(amount);
+        emit Transfer(sender, recipient, amount);
+    }
+}