feat: Split v1 and v2 apis

v1/src/lib/Models/mailer.model.js

@@ -0,0 +1,8 @@
+const mongoose = require('mongoose');
+const { Schema } = mongoose;
+
+const schema = new Schema({
+    text: { type: String, required: true }
+});
+
+module.exports = mongoose.model( "mailer", schema );