SEC-2194: Add Java Config samples

samples/tutorial-xml/src/main/java/bigbank/BankService.java

@@ -0,0 +1,16 @@
+package bigbank;
+
+import org.springframework.security.access.prepost.PreAuthorize;
+
+
+public interface BankService {
+
+    public Account readAccount(Long id);
+
+    public Account[] findAccounts();
+
+    @PreAuthorize(
+            "hasRole('supervisor') or " +
+            "hasRole('teller') and (#account.balance + #amount >= -#account.overdraft)" )
+    public Account post(Account account, double amount);
+}