support multi-module (#4)

* add multimodule
* re-package modules

server/internal/generator/planet.go

@@ -0,0 +1,43 @@
+package generator
+
+import (
+	"fmt"
+	"math/rand"
+)
+
+type PlanetClass string
+
+const (
+	PlanetClassHW        PlanetClass = "HW"
+	PlanetClassDW        PlanetClass = "DW"
+	PlanetClassGiant     PlanetClass = "Giant"
+	PlanetClassBig       PlanetClass = "Big"
+	PlanetClassNormal    PlanetClass = "Normal"
+	PlanetClassRich      PlanetClass = "Rich"
+	PlanetClassAsterioid PlanetClass = "Asteroid"
+)
+
+type Planet struct {
+	PlanetClass PlanetClass
+	Position    Coordinate
+	Size        float64
+	Resources   float64 // Сырьё
+}
+
+type PlanetarySystem struct {
+	HW Planet
+	DW []Planet
+}
+
+func (p Planet) RandomName() string {
+	return fmt.Sprintf("%s-%04d-%04d", p.PlanetClass, rand.Intn(1000), rand.Intn(1000))
+}
+
+func NewPlanet(pc PlanetClass, c Coordinate, size, resources float64) Planet {
+	return Planet{
+		PlanetClass: pc,
+		Position:    c,
+		Size:        size,
+		Resources:   resources,
+	}
+}