added controllers

server/src/controllers/AuthenticationController.js

+module.exports={
+    register(req, res){
+        
+        res.send({
+        message: 'hello ${req.body.email} ! Your user was registered! Have fun!'
+            
+    })
+  }
+}
\ No newline at end of file

server/src/routes.js

-module.exports = (app) => {
-
-    app.post('/register',(req, res) =>{
+const AuthenticationController = require('./controllers/AuthenticationController')
 
-        res.send({
-            message: 'hello ${req.body.email} ! Your user was registered! Have fun!'
-        })
+module.exports = (app) => {
 
-    })
+    app.post('/register',
+    AuthenticationController.register)
 }