docs: docs パッケージのソースコードにドキュメントを追加

[MikuroXina]

close #1073

Type of Change:

ドキュメントの追加

Details of implementation (実施内容)

src/ にディレクトリ構成を表す README.md を追加しました. そして各コンポーネントに TSDoc 形式のドキュメントコメントを追記しました.

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[codecov[bot]]

Codecov Report

Merging #1109 (a1f6d8a) into main (3fffe8f) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #1109   +/-   ##
=======================================
  Coverage   72.43%   72.43%           
=======================================
  Files          80       80           
  Lines        5464     5464           
  Branches      486      486           
=======================================
  Hits         3958     3958           
  Misses       1021     1021           
  Partials      485      485           

Flag	Coverage Δ
unittests	72.43% <ø> (ø)

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