first commit adding files and directories

Author: ZabihollahNamazi

middleware-costum/.gitignore

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+node_modules/
+.env

middleware-costum/app.js

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+import express from "express";
+
+const app = express();
+

middleware-costum/middleware/jsonArrayMiddleware.js

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