[Feature | Document] add FAQ section in document

[MooooCat]

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🚅Description

Many users are asking the same or similar questions.

🏕Solution(optional)

We will first collect related/similar/same questions, then summarize them as FAQ in the document.

This will help new users understand sdgx asap, also solve common doubts.

🍰Detail(optional)

Details will be updated in our documentation.

🍰Example(optional)

[MysteryManav]

@MooooCat I would like to work on this issue. Can you specify the questions that are to be added ? and what section/page in documentation would you like for it to be added to ?

[MooooCat]

Hi MysteryManav @MysteryManav

Sure! For now, I have collected the following frequently asked questions about synthetic data.

You can add them to the FAQ as a reference.

1. What is synthetic data?
2. What are the differences between synthetic data and real data?
3. Why do we need to use synthetic data?
4. In what situations should synthetic data be used instead of real data?
5. How to ensure the privacy and security of synthetic data? How to prevent synthetic data from being misused or leaked?

In terms of implementation, I suggest that you add FAQ.rst into docs/source/user_guides, add FAQ links to docs/source/user_guides/index.rst, and add these questions and answers according to the corresponding format.

You can draft some short answers based on the knowledge you already understand.

There are no standard answers to these answers, we can further discuss the content of these answers in the PR.

Feel free to open a PR at any time :)