[Added] Start of the DataService (and data collecting system)

backend/src/main/java/com/ninjaws/quiz/services/DataService.java

@@ -0,0 +1,27 @@
+package com.ninjaws.quiz.services;
+
+import java.util.List;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+
+import com.ninjaws.quiz.models.Question;
+import com.ninjaws.quiz.repositories.QuestionRepository;
+
+@Service
+public class DataService {
+    @Autowired
+    private QuestionRepository questionRepository;
+
+    public List<Question> getAllQuestions() {
+        return questionRepository.findAll();
+    }
+
+    public Question saveQuestion(Question question) {
+        return questionRepository.save(question);
+    }
+
+    public List<Question> saveQuestions(List<Question> questions) {
+        return questionRepository.saveAll(questions);
+    }
+}