Return address on Nest Staking factory (#15)

* Return address on Nest Staking factory

* Update the documentation

nest/src/NestStaking.sol

@@ -64,6 +64,7 @@ contract NestStaking is Initializable, AccessControlUpgradeable, UUPSUpgradeable
      * @param askPrice Price at which users can buy the AggregateToken using CurrencyToken, times the base
      * @param bidPrice Price at which users can sell the AggregateToken to receive CurrencyToken, times the base
      * @param tokenURI URI of the AggregateToken metadata
+     * @return address Address of the new AggregateToken
      */
     function createAggregateToken(
         address owner,
@@ -74,7 +75,7 @@ contract NestStaking is Initializable, AccessControlUpgradeable, UUPSUpgradeable
         uint256 askPrice,
         uint256 bidPrice,
         string memory tokenURI
-    ) public {
+    ) public returns (address) {
         AggregateToken aggregateToken = new AggregateToken();
         AggregateTokenProxy aggregateTokenProxy = new AggregateTokenProxy(
             address(aggregateToken),
@@ -85,6 +86,8 @@ contract NestStaking is Initializable, AccessControlUpgradeable, UUPSUpgradeable
         );
 
         emit TokenCreated(msg.sender, aggregateTokenProxy);
+
+        return (address(aggregateToken));
     }
 
 }