fix: BAC-29 Implement Mappers for Common Classes

knockoutwhistweb/app/dto/PlayerDTO.scala

@@ -0,0 +1,20 @@
+package dto
+
+import de.knockoutwhist.player.AbstractPlayer
+import play.api.libs.json.{Json, OFormat}
+
+case class PlayerDTO(id: String, name: String, dogLife: Boolean) 
+
+object PlayerDTO {
+
+  implicit val playerFormat: OFormat[PlayerDTO] = Json.format[PlayerDTO]
+  
+  def apply(player: AbstractPlayer): PlayerDTO = {
+    PlayerDTO(
+      id = player.id.toString,
+      name = player.name,
+      dogLife = player.isInDogLife
+    )
+  }
+  
+}