[ADD] 質問リストを受け取るメソッドを作成しました。

src/main/java/com/example/demo/app/domain/service/QuestionService.java

@@ -0,0 +1,9 @@
+package com.example.demo.app.domain.service;
+
+import java.util.List;
+
+import com.example.demo.app.infra.entity.QuestionEntity;
+
+public interface QuestionService {
+	public List<QuestionEntity> findAll();
+}

src/main/java/com/example/demo/app/domain/service/impl/QuestionServiceImpl.java

@@ -0,0 +1,23 @@
+package com.example.demo.app.domain.service.impl;
+
+import java.util.List;
+
+import org.springframework.stereotype.Service;
+
+import com.example.demo.app.domain.service.QuestionService;
+import com.example.demo.app.infra.entity.QuestionEntity;
+import com.example.demo.app.infra.repository.QuestionRepository;
+
+import lombok.RequiredArgsConstructor;
+
+@Service
+@RequiredArgsConstructor
+public class QuestionServiceImpl implements QuestionService{
+
+	private final QuestionRepository questionRepository;
+	
+	public List<QuestionEntity> findAll() {
+		return questionRepository.findAll();
+	}
+	
+}