Adds staff notifications for user DM reactions

REACTION_FEATURE_README.md

@@ -0,0 +1,58 @@
+# User Reaction Notification Feature
+
+## Overview
+
+This feature allows moderators to be notified when users react to modmail messages. When a user reacts to a message sent by the bot in their DMs, a notification will appear in the corresponding modmail thread.
+
+## Configuration
+
+Add these settings to your `config.ini` file:
+
+```ini
+# Enable reaction notifications
+notifyOnReaction = on
+
+# Enable reaction removal notifications (optional)
+notifyOnReactionRemoval = on
+```
+
+## How it works
+
+1. **When enabled**: Staff members will see notifications like:
+
+   - `Janooba reacted to message 17 with :thumbsup:`
+   - `Janooba removed reaction :thumbsdown: from message 17`
+
+2. **Only tracks reactions to staff replies**: The bot only notifies about reactions to messages sent FROM staff TO users (not reactions to user messages)
+
+3. **Works with both Unicode and custom emojis**:
+   - Unicode: 👍, 😊, etc.
+   - Custom: <:kekw:123456789>
+
+## Required Discord Permissions
+
+The bot now requests these additional intents:
+
+- `directMessageReactions` - For DM reaction notifications
+- `guildMessageReactions` - For server reaction notifications
+
+## Files Modified
+
+- `src/main.js` - Added reaction event handlers
+- `src/bot.js` - Added required Discord intents
+- `src/data/cfg.schema.json` - Added configuration options
+- `src/data/cfg.jsdoc.js` - Added JSDoc documentation
+- `docs/configuration.md` - Added documentation
+- `config.example.ini` - Added example configuration
+
+## Testing
+
+1. Enable the feature in your config
+2. Start the bot
+3. Send a reply to a user from a modmail thread
+4. Have the user react to the message in their DMs
+5. Check the modmail thread for the notification
+
+## Error Handling
+
+The feature includes try-catch blocks to prevent crashes and logs errors to the console if something goes wrong.