added some "world" conatainers

# MUOG - Universe

The organisation of the MUOG universe.

## Organisation

* Universe

    * Galaxies

* Galaxy

    * StarSystems

* StarSystem

    * Stars

    * Planets

* Stars

* Planet

    * Moons

    * Zones

* Moon

    * Zones

* Zone

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package universe

// Galaxy is a container for planets.

type Galaxy struct {

	Name        string        // the name of the galaxy

	StarSystems []*StarSystem // star systems belonging to this galaxy

}

package universe

// Moon information.

type Moon struct {

	Name  string  // the name of the moon

	Zones []*Zone // zones belonging to this moon

}

package universe

// Planet to be done

type Planet struct {

	Name  string  // the name of the planet

	Moons []*Moon // moons belonging to this planet

	Zones []*Zone // zones belonging to this planet

}

package universe

// Star contains information.

type Star struct {

	Name string // the name of the star

}