Add Readme

README.md

+# KNavalBattel
+
+Naval Battle is a ship sinking game. Ships are placed on a board which
+represents the sea. Players try to hit each others ships in turns without knowing
+where they are placed. The first player to destroy all ships wins the game.
+
+## Screenshot
+
+![Screenshot of KNavalBattle](https://cdn.kde.org/screenshots/knavalbattle/knavalbattle.png)
+
+## License
+
+This project is licensed under GPL-2.O-or-later.