Upgrade to .net 5

Address breaking changes from Shogi.API nuget

Gameboard.ShogiUI.Sockets/Managers/ClientActionHandlers/CreateGameHandler.cs

@@ -30,9 +30,9 @@ namespace Websockets.Managers.ClientActionHandlers
     {
       logger.LogInformation("Socket Request \n{0}\n", new[] { json });
       var request = JsonConvert.DeserializeObject<CreateGameRequest>(json);
-      var postGameResponse = await repository.PostGame(new PostGame
+      var postSessionResponse = await repository.PostSession(new PostSession
       {
-        GameName = request.GameName,
+        SessionName = request.GameName,
         PlayerName = userName, // TODO : Investigate if needed by UI
         IsPrivate = request.IsPrivate
       });
@@ -42,12 +42,12 @@ namespace Websockets.Managers.ClientActionHandlers
         PlayerName = userName,
         Game = new Game
         {
-          GameName = postGameResponse.GameName,
+          GameName = postSessionResponse.SessionName,
           Players = new string[] { userName }
         }
       };
 
-      if (string.IsNullOrWhiteSpace(postGameResponse.GameName))
+      if (string.IsNullOrWhiteSpace(postSessionResponse.SessionName))
       {
         response.Error = "Game already exists.";
       }