Add netspeed applet (#8118)

* feat: Add new Net Speed applet for displaying network speed, session/daily usage, and ping.

* docs: Add README with applet description, features, and installation instructions.

* feat: Move applet metadata to `metadata.json`, add `license` to `info.json`, and refine applet name/description.

* fix: Set monospace font for applet label to prevent width jitter

* Update metadata.json

---------

Co-authored-by: claudiux <[email protected]>

Author: iMayhem

netspeed@iMayhem/README.md

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+# Net Speed
+
+A lightweight, text-only network speed applet for Linux Mint Cinnamon.
+
+Net Speed displays real-time download and upload speeds directly on the panel,
+without icons, menus, or hover interactions.
+
+
+<img width="1366" height="768" alt="screenshot" src="https://github.com/user-attachments/assets/26db130a-cd0f-494b-97a3-c36c12bdd90b" />
+
+
+## Features
+- Text-only display on the Cinnamon panel
+- Real-time download (↓) and upload (↑) speed
+- Auto-detects the active network interface
+- Ignores loopback and inactive interfaces
+- Optional compact and vertical display modes
+- Configurable refresh interval
+- Low CPU and memory usage
+- No root permissions required
+
+## Installation
+Right-click the Cinnamon panel → Applets → Download → search for **Net Speed**.
+
+## Local Installation (for development)
+Copy the applet folder to:
+
+~/.local/share/cinnamon/applets/
+
+Then reload Cinnamon (`Alt + F2`, type `r`, press Enter).
+
+## License
+MIT

netspeed@iMayhem/files/netspeed@iMayhem/LICENSE

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+MIT License
+
+Copyright (c) 2025 iMayhem
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND.

netspeed@iMayhem/files/netspeed@iMayhem/README.md

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+# Net Speed
+
+A lightweight, text-only network speed applet for Linux Mint Cinnamon.
+
+Net Speed displays real-time download and upload speeds directly on the panel,
+without icons, menus, or hover interactions.
+
+
+<img width="1366" height="768" alt="screenshot" src="https://github.com/user-attachments/assets/26db130a-cd0f-494b-97a3-c36c12bdd90b" />
+
+
+## Features
+- Text-only display on the Cinnamon panel
+- Real-time download (↓) and upload (↑) speed
+- Auto-detects the active network interface
+- Ignores loopback and inactive interfaces
+- Optional compact and vertical display modes
+- Configurable refresh interval
+- Low CPU and memory usage
+- No root permissions required
+
+## Installation
+Right-click the Cinnamon panel → Applets → Download → search for **Net Speed**.
+
+## Local Installation (for development)
+Copy the applet folder to:
+
+~/.local/share/cinnamon/applets/
+
+Then reload Cinnamon (`Alt + F2`, type `r`, press Enter).
+
+## License
+MIT