[FEATURE] Display the questions and answers on the Content section

[adamma1024]

🎯 Feature Name

Display the questions and answers

🛠️ Problem Statement

The content section shows nothing currently.

💡 Describe the solution you'd like

• Add requests state: in_progress, succeed, failed
• Add requests' interfaces. feature: implement basic Q&A functionality #26
• Mock the data

[Linchen-Xu]

resolved in #32