Feature/erc777 #1159

contracts/drafts/ERC777/ERC777.sol

@@ -0,0 +1,47 @@
+pragma solidity ^0.5.2;
+
+import "./ERC777Base.sol";
+
+
+/**
+ * @title ERC777 token implementation
+ * @notice mint an amount of tokens given to msg.sender
+ * @author Bertrand Masius <[email protected]>
+ * @dev see https://github.com/ethereum/EIPs/blob/master/EIPS/eip-777.md
+ */
+contract ERC777 is ERC777Base {
+    /*
+     * @dev constructor
+     * @param name name of the token
+     * @param symbol symbol of the token
+     * @param granularity granularity of token
+     * @param defaultOperators array of default operators address
+     * @param initialSupply amount of tokens given to msg.sender
+     * @param data bytes information attached to the send, and intended for the recipient (to)
+     * @param operatorData bytes extra information provided by the operator (if any)
+     */
+    constructor(
+        string memory name,
+        string memory symbol,
+        uint256 granularity,
+        address[] memory defaultOperators,
+        uint256 initialSupply,
+        bytes memory data,
+        bytes memory operatorData
+    )
+    public
+    ERC777Base(
+        name,
+        symbol,
+        granularity,
+        defaultOperators
+    ) {
+        _mint(
+            msg.sender,
+            msg.sender,
+            initialSupply,
+            data,
+            operatorData
+        );
+    }
+}