Added base classes

src/main/java/me/zacharias/bank/SavingsAccount.java

@@ -0,0 +1,13 @@
+package me.zacharias.bank;
+
+public class SavingsAccount extends Account{
+    
+    public SavingsAccount(String name, int balance) {
+        super(name, balance);
+    }
+    
+    @Override
+    double getInterestRate() {
+        return 0.05;
+    }
+}