Add BadgerDrop - Modern GTK4 AppImage installer

[baloghd]

Description

Add BadgerDrop to the System Maintenance section.

BadgerDrop is a modern GTK4/LibAdwaita-based AppImage installer for Linux featuring:

• Drag-and-drop interface for easy AppImage installation
• Automatic desktop integration (.desktop entries, icons)
• User-only installation (~/Applications, no sudo required)
• Optional sound notifications
• Settings management for installation preferences

Checklist

• I have read and understood the contribution guidelines
• The software is available for Linux
• The software is actively maintained
• I have placed the software in the appropriate category (System Maintenance)
• I have followed the existing format with OSS icon
• The description is concise and informative

Category Justification

Placed under "System Maintenance" alongside other AppImage tools like AppImageLauncher and AppImage Pool, as it helps users manage and install AppImage applications on their system.

Summary by Sourcery

Documentation:

• Document BadgerDrop as a modern GTK4 drag-and-drop AppImage installer with desktop integration in the System Maintenance tools list.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Adds BadgerDrop, a modern GTK4-based AppImage installer, to the System Maintenance section of the README alongside other AppImage management tools, following the existing open-source listing format.

File-Level Changes

Change	Details	Files
Add BadgerDrop to the System Maintenance / AppImage tools list in the README using the standard OSS entry format and concise description.	Insert a new list entry for BadgerDrop in the System Maintenance section after AppImage Pool and before bauh. Link the OSS badge and project name to the BadgerDrop GitHub repository. Provide a short description highlighting that BadgerDrop is a modern GTK4 drag-and-drop AppImage installer with desktop integration, consistent with surrounding entries’ style.	README.md

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Hey - I've reviewed your changes and they look great!

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