commit 57cb1087a98243cb08d029c884e8534a17b78361
Author: long <18782126717@163.com>
Date:   Wed Jul 6 11:25:40 2022 +0800

    初始化合约项目

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+# Open Zeppelin Contracts
+
+This is a sample project of [OpenZeppelin contracts](https://openzeppelin.com/contracts/).
+
+## Smart Contracts
+
+- **contracts/GLDToken.sol**: a smart contract implements [ERC-20](https://docs.openzeppelin.com/contracts/4.x/erc20).
+- **contracts/GameItem.sol**: a smart contract implements [ERC-721](https://docs.openzeppelin.com/contracts/4.x/erc721).
+- **contracts/GameItems.sol**: a smart contract implements [ERC-1155](https://docs.openzeppelin.com/contracts/4.x/erc1155).
+
+## Reference
+
+- GitHub: https://github.com/OpenZeppelin/openzeppelin-contracts
+- Documentation: https://docs.openzeppelin.com/contracts
+
+npm install @openzeppelin/contracts
+
+truffle-flattener contracts/GameItem.sol > GameItem.sol