Creating a Simple DeFi Smart Contract

pragma solidity ^0.8.0;

contract MyToken {
    string public name = 'MyToken';
    string public symbol = 'MTK';
    uint256 public totalSupply = 1000000;
    mapping(address => uint256) public balanceOf;

    constructor() {
        balanceOf[msg.sender] = totalSupply;
    }

    function transfer(address _to, uint256 _value) public returns (bool success) {
        require(balanceOf[msg.sender] >= _value, 'Insufficient balance');
        balanceOf[msg.sender] -= _value;
        balanceOf[_to] += _value;
        return true;
    }
}