Initial commit with 🏗️ create-eth @ 2.0.4

packages/hardhat/contracts/01_Staking/OracleToken.sol

@@ -0,0 +1,65 @@
+// SPDX-License-Identifier: MIT
+pragma solidity >=0.8.0 <0.9.0;
+
+import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
+import "@openzeppelin/contracts/access/Ownable.sol";
+
+contract ORA is ERC20, Ownable {
+    //////////////////
+    /// Constants ////
+    //////////////////
+
+    // 0.5 ETH = 100 ORA  =>  1 ETH = 200 ORA (18 decimals)
+    uint256 public constant ORA_PER_ETH = 200;
+
+    //////////////////////
+    /// State Variables //
+    //////////////////////
+
+    ////////////////
+    /// Events /////
+    ////////////////
+
+    event OraPurchased(address indexed buyer, uint256 ethIn, uint256 oraOut);
+    event EthWithdrawn(address indexed to, uint256 amount);
+
+    /////////////////
+    /// Errors //////
+    /////////////////
+
+    error EthTransferFailed();
+
+    constructor() ERC20("Oracle Token", "ORA") Ownable(msg.sender) {
+        // Mint initial supply to the contract deployer
+        _mint(msg.sender, 1000000000000 ether);
+    }
+
+    function mint(address to, uint256 amount) public onlyOwner {
+        _mint(to, amount);
+    }
+
+    function burn(uint256 amount) public {
+        _burn(msg.sender, amount);
+    }
+
+    /**
+     * @notice Buy ORA at a fixed rate by sending ETH. Mints directly to the buyer.
+     */
+    receive() external payable {
+        _buy(msg.sender);
+    }
+
+    function buy() external payable {
+        _buy(msg.sender);
+    }
+
+    function quoteOra(uint256 ethAmountWei) public pure returns (uint256) {
+        return ethAmountWei * ORA_PER_ETH;
+    }
+
+    function _buy(address buyer) internal {
+        uint256 oraOut = quoteOra(msg.value);
+        _mint(buyer, oraOut);
+        emit OraPurchased(buyer, msg.value, oraOut);
+    }
+}