Daikombat online now can be played on macOS and Linux

Apart from Windows, the game can finally run as a JAR file on macOS and Linux. 

Mac 

1. Install Java(14+)
2. Download the game JAR file
3. Open Terminal in the same folder
4. Run "java -XstartOnFirstThread -jar daikombat.jar"

Linux 

1. Install Java(14+)
2. Download the game JAR file
3. Open a command line in the same folder
4. Run "java -jar daikombat.jar"