Add documents about AeFinder introduction and how to set up an AeFinder plugin

[xiboXD]

No description provided.

[vizipi]

Pull request analysis by VIZIPI

Below you will find who is the most qualified team member to review your code.
This analysis includes his/her work on the code included in this Pull request, in addition to their experience in code affected by these changes ( partly found within the list of potential missing files below )   Feedback always welcome

Reviewers with knowledge related to these changes

Match %	Person	Commit Count	Common Files
100.00%	xibo	8	4
25.00%	AbigailDeng	9	1
25.00%	ZhangXin	7	1
25.00%	wangyue	5	1
25.00%	eanzhao	5	1
25.00%	lhoopox	2	1

---

Potential missing files from this Pull request

files commonly committed with a subset of this pr, but not committed this time. (click to collapse)

File	Percentile	rate
docs-sphinx/tutorials/testnet.md	60.00%	3 out of 5 times

---

Committed file ranks

(click to expand)

73.82%[docs-sphinx/tutorials/indexer/index.rst]

94.40%[docs-sphinx/index.rst]

57.18%[docs-sphinx/tutorials/indexer/build-an-AeFinder-plugin.rst]

57.18%[docs-sphinx/tutorials/indexer/AeFinder-introduction.rst]

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (b18c34c) 91.05% compared to head (19ef3d2) 91.05%.

Additional details and impacted files

@@           Coverage Diff           @@
##             docs    #3522   +/-   ##
=======================================
  Coverage   91.05%   91.05%           
=======================================
  Files         619      619           
  Lines       23682    23682           
  Branches     2093     2093           
=======================================
  Hits        21563    21563           
  Misses       1988     1988           
  Partials      131      131