[doc] Doc Update

README.md

@@ -9,6 +9,31 @@ _🚀This is the client of the multimedia server Abyss, which can also be extend
 <img src="aether_clip.png" width="25%" alt="Logo">
 </div>
 
+## 🎯 Target
+
+The ultimate goal of this software project is to enable anyone to easily build a smooth media library that they can fully manage and control, 
+contribute to with trusted individuals, and securely access from any location without worrying about unauthorized use of their data by third parties. 
+Undoubtedly, this is a distant goal, but in any case, 
+I hope this project can make a modest contribution to the advancement of cybersecurity and the protection of user privacy.
+
+## Key Features
+
+- **Media Management**: Organize and serve images, videos, and live streams with structured directory support.
+- **User Authentication**: Challenge-response authentication using **Ed25519** signatures. No private keys are ever transmitted.
+- **Role-Based Access Control (RBAC)**: Hierarchical user privileges with configurable permissions for resources.
+- **Secure Proxy**: Built-in HTTP/S proxy with end-to-end encrypted tunneling using **X25519** key exchange and **ChaCha20-Poly1305** encryption.
+- **Resource-Level Permissions**: Fine-grained control over files and directories using a SQLite-based attribute system.
+- **Task System**: Support for background tasks such as media uploads and processing with chunk-based integrity validation.
+- **RESTful API**: Fully documented API endpoints for media access, user management, and task control.
+
+## Technology Stack
+
+- **Backend**: ASP.NET Core 9, MVC, Dependency Injection
+- **Database**: SQLite with async ORM support
+- **Cryptography**: NSec.Cryptography (Ed25519, X25519), ChaCha20Poly1305
+- **Media Handling**: Range requests, MIME type detection, chunked uploads
+- **Security**: Rate limiting, IP binding, token expiration, secure headers
+
 ## Development background
 
 - Operating System: Voidraw OS v1.1 (based on Ubuntu) or any compatible Linux distribution.