feat(auth): implemented users and user auth

#5 [Story] Create User Sessions

knockoutwhistweb/app/model/sessions/PlayerSession.scala

@@ -0,0 +1,13 @@
+package model.sessions
+
+import de.knockoutwhist.utils.events.SimpleEvent
+
+import java.util.UUID
+
+trait PlayerSession {
+  
+  def id: UUID
+  def name: String
+  def updatePlayer(event: SimpleEvent): Unit
+  
+}