Add README middleware-EX1

Author: ike-agu

middleware-Ex1/README.md

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+# Middleware Exercise 1 – Custom Express Middlewares
+
+## Description
+
+This project is a small Express application demonstrating how to create and use **custom middleware**.
+
+The application includes:
+
+* A middleware that reads the `X-Username` request header and attaches it to the request
+* A middleware that manually parses the POST request body as a JSON array of strings
+* A POST endpoint that uses the data provided by the middlewares to build a response
+
+---
+
+## Setup & Run
+
+```bash
+npm install
+node server.js
+```
+
+Server runs on:
+
+```
+http://localhost:3000
+```
+
+---
+
+## POST Request
+
+* Endpoint: `POST /`
+* Body must be a **JSON array of strings**
+* Header `X-Username` is optional
+
+---
+
+## Example Request
+
+```bash
+curl -X POST \
+  -H "X-Username: Ahmed" \
+  --data '["Bees"]' \
+  http://localhost:3000
+```
+
+---
+
+## Example Response
+
+```
+You are authenticated as Ahmed.
+You have requested information about 1 subject: Bees.
+``
+---