添加使用说明文档

4dkankan-utils-email/README.md

@@ -4,6 +4,6 @@
 spring.mail.host=smtp.exmail.qq.com
 spring.mail.port=465
 spring.mail.username=4Dkankan@4dage.com
-spring.mail.password=6996790AAaa
+spring.mail.password=
 spring.mail.properties.mail.socketFactory.port=465
 spring.mail.properties.mail.smtp.socketFactory.class=javax.net.ssl.SSLSocketFactory