feat: WishlistRepository 추가

Author: MEOHIN

src/main/java/com/back/domain/wishlist/repository/WishlistRepository.java

@@ -0,0 +1,9 @@
+package com.back.domain.wishlist.repository;
+
+import com.back.domain.wishlist.entity.Wishlist;
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.stereotype.Repository;
+
+@Repository
+public interface WishlistRepository extends JpaRepository<Wishlist, Long> {
+}