docs: Set up initial documentation structure (#5)

[Chafficui]

Description

Set up the initial documentation structure using GitBook and created placeholders for future API documentation.

Related Issue

Closes #5

Type of Change

• [x ] Documentation update

Checklist

• My code follows the contribution guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Code coverage remains at or above 80%
• Commit messages follow the project's commit convention
• I have updated the CHANGELOG.md file

Additional Notes

[codecov]

Codecov Report

Attention: Patch coverage is 76.92308% with 3 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
.../kotlin/de/chafficplugins/chafficLib/ChafficLib.kt	76.92%	0 Missing and 3 partials ⚠️

@@           Coverage Diff           @@
##             main       #6   +/-   ##
=======================================
  Coverage        ?   80.00%           
  Complexity      ?        5           
=======================================
  Files           ?        1           
  Lines           ?       15           
  Branches        ?        0           
=======================================
  Hits            ?       12           
  Misses          ?        0           
  Partials        ?        3           

Files with missing lines	Coverage Δ	Complexity Δ
.../kotlin/de/chafficplugins/chafficLib/ChafficLib.kt	80.00% <76.92%> (ø)	5.00 <5.00> (?)

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