Add Sending Mail Functionality

src/libs/middlewares/email.js

+const nodemailer = require('nodemailer');
+
+let transporter = nodemailer.createTransport({
+    "port": 25,
+    "host": "mx.c3sl.ufpr.br",
+    "secure": false,
+    "ignoreTLS": true
+});
+
+let mailOptions = {
+    "from": "\"Laboratório de Dados Educacionais\" <lde@c3sl.ufpr.br>",
+    "to": "<dadoseducacionais@ufpr.br>"
+};
+
+module.exports = function send(content, callback) {
+    mailOptions.content = content;
+    transporter.sendMail(mailOptions, (err, info) => {
+        if (err)
+            return callback(err);
+        callback(null, info);
+    });
+}