Create reference docs for client-side API

[jonathanbossenger]

Creates Abilities client-side API reference docs

• Includes link to package readme for installing and usage instructions
• Lists all API functions with example code

Closes #86

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.69%. Comparing base (cbe8a59) to head (54849b9).

Additional details and impacted files

@@            Coverage Diff            @@
##              trunk      #87   +/-   ##
=========================================
  Coverage     85.69%   85.69%           
  Complexity      103      103           
=========================================
  Files            16       16           
  Lines           776      776           
  Branches         86       85    -1     
=========================================
  Hits            665      665           
  Misses          111      111           

Flag	Coverage Δ
javascript	92.66% <ø> (ø)
unit	82.97% <ø> (ø)

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[github-actions]

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Co-authored-by: jonathanbossenger <psykro@git.wordpress.org>
Co-authored-by: gziolo <gziolo@git.wordpress.org>
Co-authored-by: emdashcodes <emdashcodes@git.wordpress.org>

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[jonathanbossenger]

Finally got round to testing example code
Added link back to package readme

[Copilot]

Pull Request Overview

This PR creates comprehensive reference documentation for the JavaScript/TypeScript client-side API for WordPress Abilities. The documentation provides developers with detailed function references, examples, and error handling patterns for interacting with the Abilities system from the browser.

Key changes:

• Added complete API reference documentation with function signatures and examples
• Included error handling patterns with specific error codes
• Updated main README to link to the new documentation

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
docs/7.javascript-client.md	New comprehensive API reference documentation covering all client-side functions with examples
README.md	Added link to new JavaScript client documentation in the table of contents

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