merge entity package to konstructor

konstructor/entity.playground.go

@@ -0,0 +1,20 @@
+package konstructor
+
+type Position struct {
+	X int
+	Y int
+	Z int
+}
+
+type Playground struct {
+	Render  Render
+	Objects []Object
+	NPCs    []NPC
+	Items   []Item
+}
+
+type Level struct {
+	ID          string
+	Name        string
+	Playgrounds []Playground
+}