added post request to achieve login response with tokens

backend/src/main/java/com/vaessl/app/connection/ConnectionController.java

@@ -0,0 +1,27 @@
+package com.vaessl.app.connection;
+
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.RestController;
+
+import com.vaessl.app.dto.ConnectionRequest;
+import com.vaessl.app.dto.ConnectionResponse;
+
+import jakarta.validation.Valid;
+
+@RestController
+public class ConnectionController {
+
+    private final ConnectionService connectionService;
+
+    public ConnectionController(ConnectionService connectionService) {
+        this.connectionService = connectionService;
+    }
+
+    @PostMapping("/login")
+    public ResponseEntity<ConnectionResponse> loginResponse(@Valid @RequestBody ConnectionRequest request) {
+        ConnectionResponse connectionResponse = connectionService.login(request);
+        return ResponseEntity.ok(connectionResponse);
+    }
+}