Ground work for Wino Calendar. (#475)

Wino Calendar abstractions.

Wino.Core/Authenticators/Base/OutlookAuthenticatorBase.cs

@@ -0,0 +1,20 @@
+using System.Threading.Tasks;
+using Wino.Core.Domain.Entities.Shared;
+using Wino.Core.Domain.Interfaces;
+using Wino.Core.Services;
+
+namespace Wino.Core.Authenticators.Base
+{
+    public abstract class OutlookAuthenticatorBase : BaseAuthenticator, IOutlookAuthenticator
+    {
+        protected OutlookAuthenticatorBase(ITokenService tokenService) : base(tokenService)
+        {
+        }
+
+        public abstract string ClientId { get; }
+
+        public abstract Task<TokenInformation> GenerateTokenAsync(MailAccount account, bool saveToken);
+
+        public abstract Task<TokenInformation> GetTokenAsync(MailAccount account);
+    }
+}