[to #348] add introduction for the whole document #428
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What problem does this PR solve?
Issue Number: to #348
Problem Description: the original document starts with "quick start", it's better to have an introduction page to describe the target reader and what this document can help to these users.
What is changed and how it works?
Added an introduction page
Code changes
Check List for Tests
This PR has been tested by the at least one of the following methods:
Side effects
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