Ground work for Wino Calendar. (#475)

Wino Calendar abstractions.

Wino.Core/Authenticators/Base/BaseAuthenticator.cs

@@ -0,0 +1,22 @@
+using System.Threading.Tasks;
+using Wino.Core.Domain.Entities.Shared;
+using Wino.Core.Domain.Enums;
+using Wino.Core.Services;
+
+namespace Wino.Core.Authenticators.Base
+{
+    public abstract class BaseAuthenticator
+    {
+        public abstract MailProviderType ProviderType { get; }
+
+        protected ITokenService TokenService { get; }
+
+        protected BaseAuthenticator(ITokenService tokenService)
+        {
+            TokenService = tokenService;
+        }
+
+        internal Task SaveTokenInternalAsync(MailAccount account, TokenInformation tokenInformation)
+            => TokenService.SaveTokenInformationAsync(account.Id, tokenInformation);
+    }
+}