docs: Please introduce the system architecture

[fireice009]

Current State

readme.md

Desired State

add system architecture

[Dot-Liu]

Thank you for your suggestion! Indeed, adding a system architecture section will help improve the clarity of the project and make it easier for contributors to understand the overall design. Now, this has been added to our to-do list and we will prioritize it. If you have any specific ideas or examples about the architecture, please feel free to share them! Thank you again for your feedback!