Add project documentation and update README

Added detailed documentation files for code of conduct, contributing guidelines, core concepts, features, and project structure in the documentation/ directory. Updated README.md to reference new documentation, expand feature descriptions, and clarify setup instructions.

documentation/FEATURES.md

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+# Features
+
+This document provides a detailed overview of the features available in Nebula.
+
+### Privacy Control
+
+Nebula is designed with your privacy in mind. You have granular control over your browsing data.
+
+-   **Clear Browsing Data:** You can easily clear your browsing history, cookies, cache, and local storage. This can be done from the settings page.
+-   **No Tracking by Default:** Nebula does not collect any personal data for tracking or advertising purposes.
+
+### Tab Management
+
+Efficiently manage your browsing session with Nebula's tab management features.
+
+-   **New Tabs:** Open new tabs to browse multiple websites at once.
+-   **Tab Controls:** Each tab has standard controls for closing.
+-   **Open in New Window:** You can pop a tab out into its own separate window.
+
+### Bookmarks
+
+Save and access your favorite websites with ease.
+
+-   **Add Bookmarks:** Save the current page to your bookmarks.
+-   **View Bookmarks:** Access your saved bookmarks from the bookmarks bar or a dedicated page.
+
+### History
+
+Nebula keeps a record of your browsing and search history to help you find your way back to previously visited sites.
+
+-   **Site History:** A list of all the websites you have visited.
+-   **Search History:** A list of all the searches you have made.
+-   **Clear History:** You can clear your history at any time from the settings page.
+
+### Performance Monitoring
+
+Nebula includes built-in tools to help you monitor the browser's performance.
+
+-   **Performance Report:** View a detailed report of performance metrics, including page load times and memory usage.
+-   **Force Garbage Collection:** Manually trigger garbage collection to free up memory.
+
+### GPU Acceleration Control
+
+For advanced users, Nebula provides tools to manage GPU acceleration.
+
+-   **GPU Diagnostics:** View detailed information about your system's GPU and its status.
+-   **GPU Fallback:** If you experience rendering issues, you can apply a GPU fallback to use a more stable rendering path. This can help resolve visual glitches or crashes.
+
+### Cross-Platform
+
+Nebula is built with Electron, allowing it to run on multiple operating systems.
+
+-   **Windows, macOS, and Linux:** Enjoy a consistent browsing experience across different platforms.