Update readme screenshot

[Muhammed-Rahif]

• Open app in fullscreen
• Paste some random general knowledge contents
• Take a screenshot
• Go to https://screely.com/ and add a frame with appropriate colors from tools. Then download it
• Replace downloaded image in public/screenshot.png

For example screenshot: https://www.reddit.com/r/sveltejs/comments/1gtlu00/notpad_reinventing_the_ordinary_notepad/

[github-actions]

👋 Hi @Muhammed-Rahif! Thank you for taking the time to report an issue in Notpad.
We’ll dive into it shortly. 🕵️‍♂️🔧
While you're here, why not add a ⭐ to the repo? Click here to star.
Your support helps us grow this project and reach more awesome contributors like you! 🚀

[Abdullanabdulaziz]

Hi, I’d like to work on this issue. Could you assign it to me?

[Muhammed-Rahif]

You asked for too many issues, I will assign them one by one.

[github-actions]

🛠️ Heads up, @Abdullanabdulaziz!
You've been assigned an issue in Notpad – ready to make your mark? 🚀
Since you're relatively new here, we highly recommend checking out our CONTRIBUTING.md.
It’s packed with helpful tips, guidelines, and best practices to ensure a smooth contribution experience.
We’re excited to see what you’ll bring to the table – happy coding! 💻✨

[Abdullanabdulaziz]

Thank you for the heads-up @Muhammed-Rahif! I’ve just updated the README screenshot and submitted a pull request for it. I understand the approach of assigning issues one by one, and I’m looking forward to working on more tasks. Please let me know if there’s anything else I can do. 🚀

[Muhammed-Rahif]

Resolved #309