Update README.md

Author: paraskevasleivadaros

README.md

@@ -8,5 +8,8 @@ UML Sequence Diagram: <br>
 
 ![Sequence Diagram](https://github.com/paraskevasleivadaros/SE-Exercise-3/blob/master/%CE%94%CE%B9%CE%AC%CE%B3%CF%81%CE%B1%CE%BC%CE%BC%CE%B1%20%CE%91%CE%BA%CE%BF%CE%BB%CE%BF%CF%85%CE%B8%CE%AF%CE%B1%CF%82%20%CF%84%CE%B7%CF%82%20%CE%9C%CE%B5%CE%B8%CF%8C%CE%B4%CE%BF%CF%85%20calculatePrice%20%CF%84%CE%B7%CF%82%20%CE%BA%CE%BB%CE%AC%CF%83%CE%B7%CF%82%20Ticket.png)
 
-## Copyright & License
+### 🛠️ Tech Stack
+[![Java](https://skills.thijs.gg/icons?i=java)](https://oracle.com/java/)
+
+### ©️ Copyright & License
 [MIT](https://github.com/paraskevasleivadaros/SE-Exercise-3/blob/master/LICENSE)