feature: email service and configuration

Disco.Models/Services/Messaging/Email.cs

@@ -0,0 +1,30 @@
+using System.Collections.Generic;
+
+namespace Disco.Models.Services.Messaging
+{
+    public class Email
+    {
+        public string From { get; set; }
+        public List<string> To { get; } = new List<string>();
+        public List<string> CC { get; } = new List<string>();
+        public List<string> BCC { get; } = new List<string>();
+
+        public string Subject { get; set; }
+        public bool IsBodyHtml { get; set; }
+        public string Body { get; set; }
+
+        public List<EmailAttachment> Attachments { get; } = new List<EmailAttachment>();
+
+        public Email()
+        {
+        }
+
+        public Email(string to, string subject, string body)
+            : this()
+        {
+            To.Add(to);
+            Subject = subject;
+            Body = body;
+        }
+    }
+}

Disco.Models/Services/Messaging/EmailAttachment.cs

@@ -0,0 +1,8 @@
+namespace Disco.Models.Services.Messaging
+{
+    public class EmailAttachment
+    {
+        public string Name { get; set; }
+        public byte[] Data { get; set; }
+    }
+}