Suggestion: Add Obtainium download option

[atharmshaikh]

Hi 👋
I wanted to suggest adding an Obtainium download button to the README .

For users who sideload the app from GitHub, Obtainium makes it much easier to get update notifications and install new versions automatically, without relying on Play Store or waiting for F-Droid updates.

This wouldn’t replace any existing download options — it would just be an extra, optional way for users who prefer GitHub-based updates.

If you’re open to it, the link could be placed under an “Other download options” or “Advanced install” section.

Thanks for the great app!