增加邮件发送功能

src/gaea/src/main/kotlin/com/synebula/gaea/io/messager/IEmailMessenger.kt

@@ -1,5 +1,14 @@
 package com.synebula.gaea.io.messager
 
 interface IEmailMessenger {
-    fun sendMessage(receivers: List<String>, subject: String, content: String)
+    /**
+     * 发送消息
+     *
+     * @param subject 邮件标题
+     * @param content 邮件内容
+     * @param receivers 邮件接受者
+     * @param files 附件
+     */
+    fun sendMessage(subject: String, content: String,
+                    receivers: List<String>, files: Map<String, String> = mapOf())
 }