feat: Add InterestsRepository (#17)

src/main/java/com/beotkkot/qtudy/repository/interests/InterestsRepository.java

@@ -0,0 +1,16 @@
+package com.beotkkot.qtudy.repository.interests;
+
+import com.beotkkot.qtudy.domain.interests.Interests;
+import com.beotkkot.qtudy.domain.primaryKey.InterestsPK;
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.stereotype.Repository;
+
+import java.util.List;
+
+@Repository
+public interface InterestsRepository extends JpaRepository<Interests, InterestsPK> {
+
+ List<Interests> findAllByUserId(Long userId);
+
+ void deleteAllByUserId(Long userId);
+}