playground header skeleton, playground screen into separated files

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

@@ -0,0 +1,8 @@
+package easy_ebitengine
+
+import "github.com/hajimehoshi/ebiten"
+
+func (e *Engine) PlaygroundDefaultPlayerDraw(screen *ebiten.Image) {
+	player := e.Domain.GetDefaultPlayer()
+	e.PlaygroundAssetDraw(screen, player.Type.Render, player.Position)
+}