Added CHI connector

contracts/connectors/chi.sol

@@ -0,0 +1,75 @@
+pragma solidity ^0.6.0;
+
+// import files from common directory
+import { TokenInterface , MemoryInterface, EventInterface} from "../common/interfaces.sol";
+import { Stores } from "../common/stores.sol";
+import { DSMath } from "../common/math.sol";
+
+interface CHIInterface {
+    function mint(uint256 value) external;
+    function free(uint256 value) external returns (uint256);
+    function balanceOf(address) external view returns (uint);
+}
+
+
+contract ChiHelpers is DSMath, Stores  {
+    /**
+     * @dev CHI token Address
+     */
+    function getCHIAddress() internal pure returns (address) {
+        return 0x0000000000004946c0e9F43F4Dee607b0eF1fA1c;
+    }
+}
+
+
+contract ChiResolver is ChiHelpers {
+    event LogMint(uint256 tokenAmt, uint256 getId, uint256 setId);
+    event LogBurn(uint256 tokenAmt, uint256 getId, uint256 setId);
+
+    /**
+     * @dev Mint CHI token.
+     * @param amt token amount to mint.
+     * @param getId Get token amount at this ID from `InstaMemory` Contract.
+     * @param setId Set token amount at this ID in `InstaMemory` Contract.
+     */
+    function mint(uint amt, uint getId, uint setId) public payable {
+        uint _amt = getUint(getId, amt);
+        _amt = _amt == uint(-1) ? 140 : _amt;
+        require(_amt <= 140, "Max minting is 140 chi");
+
+        CHIInterface(getCHIAddress()).mint(_amt);
+
+        setUint(setId, _amt);
+
+        emit LogMint(_amt, getId, setId);
+        bytes32 _eventCode = keccak256("LogMint(uint256,uint256,uint256)");
+        bytes memory _eventParam = abi.encode(_amt, getId, setId);
+        emitEvent(_eventCode, _eventParam);
+    }
+
+    /**
+     * @dev burn CHI token.
+     * @param amt token amount to burn.
+     * @param getId Get token amount at this ID from `InstaMemory` Contract.
+     * @param setId Set token amount at this ID in `InstaMemory` Contract.
+     */
+    function burn(uint amt, uint getId, uint setId) public payable {
+        uint _amt = getUint(getId, amt);
+        CHIInterface chiToken = CHIInterface(getCHIAddress());
+        _amt = _amt == uint(-1) ? chiToken.balanceOf(address(this)) : _amt;
+
+        chiToken.free(_amt);
+
+        setUint(setId, _amt);
+
+        emit LogBurn(_amt, getId, setId);
+        bytes32 _eventCode = keccak256("LogBurn(uint256,uint256,uint256)");
+        bytes memory _eventParam = abi.encode(_amt, getId, setId);
+        emitEvent(_eventCode, _eventParam);
+    }
+}
+
+
+contract ConnectCHI is ChiResolver {
+    string public name = "CHI-v1";
+}