feat: add registry

src/NebulaRegistry.sol

@@ -0,0 +1,18 @@
+// SPDX-License-Identifier: Unlicensed
+pragma solidity ^0.8.24;
+
+contract NebulaRegistry {
+    mapping(bytes8 => address) registeryMapping;
+
+    function register(address identity) external returns (bytes8) {
+        bytes8 identifier = bytes8(
+            keccak256(abi.encodePacked(identity, msg.sender))
+        );
+        registeryMapping[identifier] = identity;
+        return identifier;
+    }
+
+    function resolve(bytes8 identity) external view returns (address) {
+        return registeryMapping[identity];
+    }
+}

test/Nebula.t.sol

@@ -8,7 +8,8 @@ contract NebulaTest is Test {
     Nebula public nebula;
 
     function setUp() public {
-        nebula = new Nebula();
+        // update with correct verifier contract address
+        nebula = new Nebula(0x5B38Da6a701c568545dCfcB03FcB875f56beddC4);
     }
 
     function testNebula() public {}