docs: add SIWE demo

[yutingzhao1991]

close #1198

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Latest commit: 29dd887

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Name	Status	Preview	Comments	Updated (UTC)
ant-design-web3	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Oct 8, 2024 10:08am

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.99%. Comparing base (d3786c8) to head (29dd887).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1199   +/-   ##
=======================================
  Coverage   99.99%   99.99%           
=======================================
  Files         851      851           
  Lines       18149    18149           
  Branches     1582     1582           
=======================================
  Hits        18148    18148           
  Misses          1        1           

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