Update _index.md

Author: mokun

content/docs/guide/_index.md

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-The simulation uses Java Swing as a command line application. The app provides inline help on detailed functions. This guide provides higher level information.
+Besides using Java Swing as the default graphical UI for players to interact with the simulation, the simulation is also accompanied by a Java Swing-based console as its command line query tool that provides inline help on entities with high level of detail.