Add full feature library documentation

This document contains a comprehensive list of features including the Starboard System, Tag System, Election & Voting, and various utility and community modules.

Author: Nitya-003

docs/FEATURES.md

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+# Full Feature Library
+
+This document contains the complete list of utility, fun, and community modules.
+
+## Starboard System
+Automatically highlight high-quality community content.
+- `?starboard setup` : Define channel, emoji, and reaction threshold.
+- `?starboard cleanup` : Admin tool to remove invalid or deleted entries.
+
+## Tag System
+Store and retrieve custom text snippets.
+- `?tags create <name> <content>` : Save a reusable snippet.
+- `?tag <name>` : Fetch a saved tag.
+
+## Election & Voting
+- `?election create <title> <candidates>` : Start a democratic vote.
+- Supports **Weighted Voting** based on user roles or tenure.
+
+## Utility & Community
+- **AFK**: `?afk [reason]` - Auto-responds to mentions when you're away.
+- **Birthdays**: `?setbirthday <DD/MM>` - Automated birthday wishes.
+- **Suggestions**: `/suggest <text>` - Creates an embed with voting reactions and a discussion thread.
+- **Disboard Tracker**: `/bumplb` - View the leaderboard for users who bump the server.
+
+[← Back to README](../README.md)