Add README documenting project files and package.json

README.md

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+# simple-server
+
+A simple Express.js server built with Node.js.
+
+## Installation
+
+```bash
+npm install
+```
+
+## Usage
+
+```bash
+npm start
+```
+
+The server runs on port **7000**.
+
+## Endpoints
+
+| Method | Path | Description |
+|--------|------|-------------|
+| GET    | `/`  | Returns "Hello world!" |
+| PATCH  | `/`  | Patch endpoint handler |
+
+## File Descriptions
+
+### `package.json`
+
+The `package.json` file is the Node.js project manifest. It contains metadata about the project and manages its dependencies and scripts. Key fields include:
+
+- **name** – The name of the project (`simple-server`).
+- **version** – The current version of the project.
+- **main** – The entry point of the application (`index.js`).
+- **scripts** – Defines npm scripts. The `start` script runs the server using `nodemon`.
+- **dependencies** – Lists the packages required to run the application:
+  - `express` – Web framework for Node.js.
+  - `nodemon` – Utility that automatically restarts the server when file changes are detected.
+- **license** – The license under which the project is distributed.
+
+### `index.js`
+
+The main entry point of the application. Sets up the Express server, defines the root `GET` route, and mounts the patch route handler.
+
+### `patchHandler.js`
+
+An Express router module that handles `PATCH` requests to `/`.
+
+### `package-lock.json` / `yarn.lock`
+
+Auto-generated lock files that pin the exact versions of all installed dependencies to ensure consistent installs across environments.
+
+### `test.txt`
+
+A plain text file used for testing purposes.