Add repositories

src/main/java/com/faf223/expensetrackerfaf/repository/ExpenseRepository.java

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+package com.faf223.expensetrackerfaf.repository;
+
+import com.faf223.expensetrackerfaf.model.Expense;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+public interface ExpenseRepository extends JpaRepository<Expense, Long> {
+}

src/main/java/com/faf223/expensetrackerfaf/repository/IncomeRepository.java

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+package com.faf223.expensetrackerfaf.repository;
+
+import com.faf223.expensetrackerfaf.model.Income;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+public interface IncomeRepository extends JpaRepository<Income, Long> {
+}

src/main/java/com/faf223/expensetrackerfaf/repository/UserRepository.java

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+package com.faf223.expensetrackerfaf.repository;
+
+import com.faf223.expensetrackerfaf.model.User;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+public interface UserRepository extends JpaRepository<User, Long> {
+}