added addition connector

contracts/connectors/addition.sol

@@ -0,0 +1,78 @@
+pragma solidity ^0.6.0;
+
+interface MemoryInterface {
+    function getUint(uint _id) external returns (uint _num);
+    function setUint(uint _id, uint _val) external;
+}
+
+contract DSMath {
+
+    function add(uint x, uint y) internal pure returns (uint z) {
+        require((z = x + y) >= x, "math-not-safe");
+    }
+
+    function sub(uint x, uint y) internal pure returns (uint z) {
+        require((z = x - y) <= x, "ds-math-sub-underflow");
+    }
+}
+
+
+contract Helpers is DSMath {
+    /**
+     * @dev Return Memory Variable Address
+     */
+    function getMemoryAddr() internal pure returns (address) {
+        return 0x8a5419CfC711B2343c17a6ABf4B2bAFaBb06957F; // InstaMemory Address
+    }
+
+    /**
+     * @dev Get Uint value from InstaMemory Contract.
+    */
+    function getUint(uint getId, uint val) internal returns (uint returnVal) {
+        returnVal = getId == 0 ? val : MemoryInterface(getMemoryAddr()).getUint(getId);
+    }
+
+    /**
+     * @dev Set Uint value in InstaMemory Contract.
+    */
+    function setUint(uint setId, uint val) internal {
+        if (setId != 0) MemoryInterface(getMemoryAddr()).setUint(setId, val);
+    }
+
+    /**
+     * @dev Connector Details
+    */
+    function connectorID() public pure returns(uint _type, uint _id) {
+        (_type, _id) = (1, 47);
+    }
+}
+
+contract BasicResolver is Helpers {
+
+    /**
+     * @dev Add getIds
+     * @param setId Set ctoken amount at this ID in `InstaMemory` Contract.
+    */
+    function addIds(uint[] calldata getIds, uint setId) external payable {
+        uint amt;
+        for (uint i = 0; i < getIds.length; i++) {
+            amt = add(amt, getUint(getIds[i], 0));
+        }
+
+        setUint(setId, amt);
+    }
+
+    /**
+     * @dev Sub getIds
+     * @param setId Set ctoken amount at this ID in `InstaMemory` Contract.
+    */
+    function subIds(uint getIdOne, uint getIdTwo, uint setId) external payable {
+        uint amt = add(getUint(getIdOne, 0), getUint(getIdTwo, 0));
+
+        setUint(setId, amt);
+    }
+}
+
+contract ConnectAddition is BasicResolver {
+    string public name = "Addition-v1";
+}