Add new entities

src/main/java/entities/Expense.java

@@ -0,0 +1,41 @@
+package entities;
+
+public class Expense extends MoneyTransaction {
+
+    private int userId;
+    private int amount;
+    private ExpensesCategory category;
+
+    public Expense(int userId, int amount, ExpensesCategory category) {
+        this.userId = userId;
+        this.amount = amount;
+        this.category = category;
+    }
+
+    @Override
+    public long getUserId() {
+        return userId;
+    }
+
+    public void setUserId(int userId) {
+        this.userId = userId;
+    }
+
+    @Override
+    public int getAmount() {
+        return amount;
+    }
+
+    public void setAmount(int amount) {
+        this.amount = amount;
+    }
+
+    @Override
+    public String getCategory() {
+        return category.toString();
+    }
+
+    public void setCategory(ExpensesCategory category) {
+        this.category = category;
+    }
+}