adding files directories

Author: ZabihollahNamazi

off-the-shell-middleware/.gitignore

@@ -0,0 +1,2 @@
+node_modules/
+.env

off-the-shell-middleware/app.js

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+import express from "express";
+
+const app = express();
+
+
+// built-in middleware
+app.use(express.json());

off-the-shell-middleware/middleware/usernameMiddleware.js

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+export default function usernameMiddleware(req, res, next) {
+  const username = req.header("X-Username");
+
+  req.username = username || null;
+
+  next();
+}