Added base classes

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

@@ -0,0 +1,12 @@
+package me.zacharias.bank;
+
+public class BankAccount extends Account {
+    public BankAccount(String name, int balance) {
+        super(name, balance);
+    }
+
+    @Override
+    double getInterestRate() {
+        return 0.001;
+    }
+}