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contracts...dnote.sol

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

// This line imports the ERC-20 token standard from OpenZeppelin (OZ). OZ is an Ethereum security company. 
// Among other things, OZ develops reference contracts for popular smart contract standards which are thoroughly 
// tested and secure. Whenever implementing a smart contract which needs to comply with a standard, try to 
// find an OZ reference implementation rather than rewriting the entire standard from scratch.

import "https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/token/ERC20/ERC20.sol";

contract DNote is ERC20 {
    constructor(string memory _name, string memory _symbol) ERC20(_name, _symbol) {
        _mint(msg.sender, 10 * 10 ** 18);
    }
}