DUD-5: API for dudoser (#86)

* DUD-5: API for dudoser

* hotfix

* hotfixes-2

* hotfixes-3

* hotfixes-4

* hotfixes-5

* hotfixes-6

* hotfixes-6

* hotfixes-7

* Fixed after discussion

* hotfix-8

* hotfix-9

* hotfix-9

* Fixed after comments

* Fixed after comments. v2

* Fixed spaces

* Fixed after comments-14

* Fixed after comments-15

proto/message_sender.thrift

@@ -0,0 +1,44 @@
+include "base.thrift"
+include "domain.thrift"
+
+namespace java com.rbkmoney.damsel.message_sender
+namespace erlang message_sender
+
+struct MessageAttachment{
+    1: required string name
+    2: optional string mime_type
+    3: required binary data
+}
+
+typedef list<MessageAttachment> MessageAttachments
+
+/**
+* Здесь могут быть и другие виды сообщений, например, MessageSMS, MessagePush
+**/
+union Message{
+    1: MessageMail message_mail
+}
+
+/**
+*
+**/
+struct MailBody {
+    // Content-Type письма (вместе с кодировкой). Например, "text/plain; charset=iso-8859-1"
+    1: optional string content_type
+    2: required string text
+}
+
+struct MessageMail {
+    1: required MailBody mail_body
+    2: optional string subject
+    3: required string from_email
+    4: required list<string> to_emails
+    5: optional MessageAttachments attachments
+}
+
+service MessageSender {
+    /**
+    * Отправка сообщения.
+    **/
+    void send(1: Message message) throws (1: base.InvalidRequest ex1)
+}