added keycloak user

src/main/java/de/anxietyprime/swajodel/Routes.java

@@ -1,6 +1,8 @@
 package de.anxietyprime.swajodel;
 
 import org.springframework.http.HttpStatus;
+import org.springframework.security.core.context.SecurityContextHolder;
+import org.springframework.security.oauth2.core.oidc.user.DefaultOidcUser;
 import org.springframework.web.bind.annotation.*;
 import org.springframework.web.server.ResponseStatusException;