docs: add README with setup instructions and API endpoints

readme.md

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+
+# Moodle Timetable Server
+
+A Node.js server that fetches timetable data from WebUntis.
+
+## Setup
+
+1. Install dependencies:
+```bash
+npm install express dotenv luxon webuntis
+```
+
+2. Create a `.env` file with:
+```env
+PORT=3000
+WEBUNTIS_SCHOOL=your_school
+WEBUNTIS_USER=your_username
+WEBUNTIS_PASS=your_password
+WEBUNTIS_URL=your_webuntis_url
+```
+
+## API Endpoints
+
+- `GET /` - Health check
+- `GET /timetable` - Fetch timetable for next 4 weeks
+
+## Running
+
+```bash
+node server.js
+```
+
+Server runs on `http://localhost:3000` by default.