Added signup

back-end/final-be/.gitignore

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+# See https://help.github.com/articles/ignoring-files/ for more about ignoring files.
+
+# dependencies
+/node_modules
+/.pnp
+.pnp.js
+
+# testing
+/coverage
+
+# production
+/build
+
+# misc
+.DS_Store
+.env.local
+.env.development.local
+.env.test.local
+.env.production.local
+
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*

back-end/final-be/app/config/db.config.js

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+module.exports = {
+  url: "mongodb+srv://admin:N7qOG68k01sI3oh3@cluster0.uriqb.mongodb.net/DigitalPhoenix?retryWrites=true&w=majority"
+};

back-end/final-be/app/controllers/question.controller.js

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+const StoreAnswers = require("../models/question.model");
+const User = require("../models/user.model");
+
+exports.store = (req, res) => {
+    var newRequest = new StoreAnswers();
+    newRequest.userId = req.body.userId;
+    newRequest.answers = req.body.answers;
+    newRequest.is_learning = req.body.is_learning;
+    newRequest.save()
+      .then((result) => {
+        User.findById(newRequest.userId, (err, user) => {
+            if (user) {
+                // The below two lines will add the newly saved answer request
+                user.answers.push(newRequest);
+                user.save();
+                res.json({ message: 'Answer stored!' });
+            }
+        });
+      })
+      .catch((error) => {
+        res.status(500).json({ error });
+      });
+};