docs: Add cronjob setup instructions to README

README.md

@@ -24,11 +24,26 @@ Please refer to the [arcade-button-wiring.md](arcade-button-wiring.md) file for
 
 ## Usage
 1. Make sure your audio file (`Laid Back - Sunshine Reggae.mp3` or any other MP3 you prefer) is in the project directory.
-2. Run the alarm clock script:
+2. Run the alarm clock script manually:
    ```bash
    python3 wecker.py
    ```
 
+## Automating with Cron
+To have the alarm start automatically at a specific time (e.g., 6:45 AM on weekdays), you can set up a cronjob.
+
+1. Open your crontab configuration:
+   ```bash
+   crontab -e
+   ```
+2. Add the following line at the end of the file (adjust the paths if your setup differs):
+   ```bash
+   45 6 * * 1-5 cd /home/pi/workspace/wecker && /usr/bin/python3 wecker.py > /home/pi/workspace/wecker/cron.log 2>&1
+   ```
+   * `45 6`: Runs at 6:45 AM.
+   * `* * 1-5`: Runs from Monday (1) to Friday (5). Skips the weekend.
+   * It ensures the script runs in the correct directory so it can find the audio file.
+
 ## How the Puzzle Works
 1. **Ringing:** The music plays in an endless loop.
 2. **Start:** Press the arcade button once to start the puzzle. Wait 3 seconds.