Add an inventory to the rover

pkg/game/items.go

@@ -0,0 +1,14 @@
+package game
+
+// Each item is a specific type
+const (
+	ItemNone = byte(0)
+
+	// Describes a single rock
+	ItemRock = byte(1)
+)
+
+// Item describes an item that can be held
+type Item struct {
+	Type byte `json:"type"`
+}