support multi-module (#4)

* add multimodule
* re-package modules

server/internal/model/game/science.go

@@ -0,0 +1,14 @@
+package game
+
+import (
+	"github.com/google/uuid"
+)
+
+type Science struct {
+	ID      uuid.UUID `json:"id"`
+	Name    string    `json:"name"`
+	Drive   Float     `json:"drive"`
+	Weapons Float     `json:"weapons"`
+	Shields Float     `json:"shields"`
+	Cargo   Float     `json:"cargo"`
+}