feat: adds Trinitie's lesson_21 about working with Express (#690)

* feat: adds branch and assets from lesson_19

* feat: adds json files and rearrange file structures

* feat: adds server file and rearrange files again

* chore: upadates code in server file

* chore: updates code and names

* feat: adds sign_up form files

* feat: adds js file for sign_up and updates html for sign_up

* chore: updates code

* chore: updates code to make look prettier

* feat: adds thank_you file

* feat: adds thank_you file for results and make code look prettier

* chore: updates code to redirect to thank_you

Author: txjackson252

lesson_21/trinitiejackson/index.js

@@ -0,0 +1,31 @@
+var debug = require('debug')('myapp:server'); 
+const express = require("express"); 
+const morgan = require("morgan"); 
+const path = require("path"); 
+ 
+const app = express();
+
+app.use(morgan("dev"));
+app.use(express.json()); 
+app.use(express.urlencoded({ extended: true }));
+app.use(express.static(path.join(__dirname, "public")));
+
+app.get("/", (req, res) => {
+    res.sendFile(path.join(__dirname, "public/sign_up/sign_up.html"));
+});
+
+app.post("/sign_up", express.json(), (req, res) => {
+    const { name, email, message } = req.body;
+    if (!name || !email || !message) {
+        return res.status(400).json({ message: "All fields are required." });
+    }
+
+    console.log("New sign up:", { name, email, message });
+    res.redirect("/sign_up/thank_you.html");
+});
+
+const PORT = process.env.PORT || 3000;
+
+app.listen(PORT, () => {
+ debug(`Server listening on http://localhost:${PORT}`);
+});