Add claude-usage@mtwebster. (#8132)

Monitors claude AI usage for given credentials and displays it in
the panel.

Author: mtwebster

claude-usage@mtwebster/CHANGELOG.md

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+files/claude-usage@mtwebster/CHANGELOG.md

claude-usage@mtwebster/README.md

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+files/claude-usage@mtwebster/README.md

claude-usage@mtwebster/files/claude-usage@mtwebster/CHANGELOG.md

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+## 1.0.0
+
+Initial release

claude-usage@mtwebster/files/claude-usage@mtwebster/README.md

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+# Claude Usage Monitor
+
+A Cinnamon panel applet that displays Claude API usage limits (5-hour and 7-day) by polling the Anthropic API endpoint.
+
+## Features
+
+- Displays 5-hour and 7-day usage percentages in the panel
+- Color-coded text: green (<50%), yellow (50-80%), red (>80%)
+- Configurable polling interval (1-60 minutes, default 5)
+- Tooltip shows reset times and last update time
+- Custom credentials path support
+
+## Requirements
+
+- Claude Code installed and configured (provides API credentials)
+- Alternatively, you can specify a custom path to your Claude credentials file
+- *Long-lived API keys are not supported (claude setup-token).* You can revert to a 'normal' token by deleting your credentials file and logging in using `/login`.
+- Internet access (for calls to `https://api.anthropic.com/api/oauth/usage`).
+
+## Installation
+
+### From Cinnamon Settings (Recommended)
+
+1. Open Cinnamon Settings → Applets
+2. Go to the "Download" tab
+3. Search for "Claude Usage Monitor"
+4. Click "Install"
+5. Enable the applet in the "Manage" tab
+
+### Manual Installation
+
+1. Download and extract the applet
+2. Copy the folder `claude-usage@mtwebster` to `~/.local/share/cinnamon/applets/`
+3. Enable the applet in Cinnamon Settings → Applets
+
+## License
+
+GPL-3.0 License.
+
+[Changelog](https://github.com/linuxmint/cinnamon-spices-applets/blob/master/claude-usage@mtwebster/CHANGELOG.md)