added mongose and express, modified server, for testing purpose added user controller, model and routes

api/controllers/userController.js

@@ -0,0 +1,54 @@
+'use strict';
+
+var mongoose = require('mongoose'),
+User = mongoose.model('User');
+
+exports.list_all = function(req, res) {
+    User.find({}, function(err, user) {
+    if (err) {
+        res.send(err);
+    }
+    res.json(user);
+  });
+};
+
+exports.add_user = function(req, res) {
+    var new_user = new User(req.body);
+    new_user.save(function(err, user) {
+        if (err) {
+            res.send(err);
+        }
+        res.json(user);
+    });
+};
+
+exports.get_user = function(req, res) {
+    User.findById(req.params.userId, function(err, user) {
+        if (err) {
+            res.send(err);
+        }
+        res.json(user);
+    });
+};
+
+// TODO modify to update user permitions
+exports.update_user = function(req, res) {
+    User.findOneAndUpdate({_id: req.params.userId}, req.body, {new: true}, function(err, user) {
+        if (err) {
+            res.send(err);
+        }
+        res.json(user);
+    });
+};
+
+// TODO modify to remove user permitions / group
+exports.remove_user = function(req, res) {
+    User.remove({
+        _id: req.params.userId
+    }, function(err, user) {
+        if (err) {
+            res.send(err);
+        }
+        res.json({ message: 'User successfully deleted' });
+    });
+};