fix: BAC-29 Implement Mappers for Common Classes

knockoutwhistweb/app/dto/HandDTO.scala

@@ -0,0 +1,18 @@
+package dto
+
+import de.knockoutwhist.cards.Hand
+import play.api.libs.json.{Json, OFormat}
+
+case class HandDTO(card: List[CardDTO])
+
+object HandDTO {
+  
+  implicit val handFormat: OFormat[HandDTO] = Json.format[HandDTO]
+  
+  def apply(hand: Hand): HandDTO = {
+    HandDTO(
+      card = hand.cards.zipWithIndex.map { case (card, idx) => CardDTO(card, idx) }
+    )
+  }
+  
+}