Add new agnostic challonge provider

LaDOSE.Src/LaDOSE.Service/Interface/IExternalProviderService.cs

@@ -0,0 +1,21 @@
+using System;
+using System.Collections.Generic;
+using System.Threading.Tasks;
+using LaDOSE.Entity;
+using LaDOSE.Entity.Challonge;
+
+namespace LaDOSE.Business.Interface
+{
+    public interface IExternalProviderService
+    {
+        Task<List<ChallongeTournament>> GetTournaments(DateTime? start, DateTime? end);
+
+        Task<TournamentsResult> GetTournamentsResult(List<int> ids);
+        Task<TournamentsResult> GetSmashResult(string tournamentSlug);
+
+        Task<TournamentsResult> GetSmashResult2(string tournamentSlug);
+
+
+        Task<List<Event>> GetChallongeEvents(List<int> ids);
+    }
+}