playground header skeleton, playground screen into separated files

konstructor/engines/easy_ebitengine/screen.playground.platform.go

@@ -0,0 +1,10 @@
+package easy_ebitengine
+
+import "github.com/hajimehoshi/ebiten"
+
+func (e *Engine) PlaygroundPlatformsDraw(screen *ebiten.Image) {
+	playground := e.GetPlayground()
+	for _, platform := range playground.Platforms {
+		e.PlaygroundAssetDraw(screen, platform.Type.Render, platform.Position)
+	}
+}