Update README.md
added link back to the article:
@@ -13,4 +13,5 @@ This module contains articles about networking in Java
- [Get the IP Address of the Current Machine Using Java](https://www.baeldung.com/java-get-ip-address)
- [Get Domain Name From Given URL in Java](https://www.baeldung.com/java-domain-name-from-url)
- [Java HttpClient Timeout](https://www.baeldung.com/java-httpclient-timeout)
+- [Port Scanning With Java](https://www.baeldung.com/java-port-scanning)
- [[<-- Prev]](/core-java-modules/core-java-networking-2)
