feat(*): Add base project files

EmailService/IEmailSender.cs

@@ -0,0 +1,14 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace EmailService
+{
+    public interface IEmailSender
+    {
+        void SendEmail(Message message);
+
+        Task SendEmailAsync(Message message);
+    }
+}