Add readme

README.md

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 Chat application with built-in game built as part of COMP1206 at the University of Southampton.
 
-Thanks goes to Oli Bills for building the backend system and template for this software.
+This application is a Maven JavaFX project with a modern interface and compatability with multiple platforms.
+
+## Showcase
+
+![Login screen](screenshots/login.png "Login screen")
+![Chat window](screenshots/chat.png "Chat window")
+![Game start window](screenshots/start_game.png "Game start window")
+![Playing the game](screenshots/play_game.png "Playing the game")
+
+## Credits
+
+Thanks goes to Oli Bills for building the backend system and template for this software.
+
+The University of Southampton logo is owned by the University of Southampton.