feat: add advanced multithreading banking system skeleton

src/main/java/dev/banking/monitor/LiveMonitor.java

@@ -0,0 +1,23 @@
+package dev.banking.monitor;
+
+import dev.banking.model.BankAccount;
+
+import java.util.Collection;
+
+public class LiveMonitor {
+
+    public void update(
+            Collection<BankAccount> accounts
+    ) {
+
+        for (BankAccount account : accounts) {
+
+            System.out.printf(
+                    "Account %d -> %d%n",
+                    account.getAccountId(),
+                    account.getBalance()
+            );
+
+        }
+    }
+}