Add CORS middleware and user database schema

- Implemented CORS middleware in the project to handle cross-origin requests.
- Added necessary files for the CORS package including README, LICENSE, and history documentation.
- Created a SQL schema for the users table with appropriate fields and constraints.
- Inserted mock data into the users table for testing purposes.

backend/server.js

@@ -1,15 +1,46 @@
 //statics
 import express from "express";
+import cors from "cors";
 const app = express();
 const port = 5002;
+import {
+  loginUser,
+  createUser,
+  updateUser,
+  deleteUser,
+  getAllUsers,
+} from "./database.js";
 
 //view engine ejs
 app.set("view engine", "ejs");
 
+app.use(express.json());
+
+app.use(cors());
+
 app.get("/", (req, res) => {
   res.render("index.ejs");
 });
 
+app.post("/api/login", async (req, res) => {
+  console.log(req.body);
+
+  loginUser(req.body.username, req.body.password)
+    .then((result) => {
+      if (result.success) {
+        res.status(200).json(result);
+      } else {
+        res.status(401).json(result);
+      }
+    })
+    .catch((err) => {
+      console.error("Error logging in:", err);
+      res
+        .status(500)
+        .json({ success: false, message: "Internal server error" });
+    });
+});
+
 app.listen(port, () => {
   console.log(`Server is running at http://localhost:${port}`);
 });