Rename doc/api/crypto.md to doc/api/npm install @openzeppelin/contracts

[kw9p52p6yr-a11y]

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

import "@openzeppelin/contracts/token/ERC20/ERC20.sol";

contract MyToken is ERC20 {
constructor() ERC20("MyToken", "MTK") {
_mint(msg.sender, 1_000_000 * 10 ** decimals());
}
}
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