Add getUser contract function

packages/concordia-contracts/contracts/Forum.sol

@@ -1,5 +1,6 @@
 //SPDX-License-Identifier: MIT
 pragma solidity 0.7.1;
+pragma experimental ABIEncoderV2;
 
 contract Forum {
 
@@ -73,6 +74,10 @@ contract Forum {
         return users[userAddress].timestamp;
     }
 
+    function getUser(address userAddress) public view returns (User memory) {
+        require(hasUserSignedUp(userAddress), "User hasn't signed up yet.");
+        return users[userAddress];
+    }
 
     //----------------------------------------POSTING----------------------------------------
     struct Topic {