Add API Support Matrix to README

[firstof9]

This PR adds a comprehensive API Support Matrix table to the README, finalized using a direct audit of the OpenEVSE ESP32 firmware source code (web_server.cpp).

Key Additions:

• Source-Verified Coverage: Added all endpoints defined in web_server_setup, including /r (RAPI), /schedule/plan, /update, and /rfid/add.
• Granular Methods: Specified exactly which HTTP methods (GET, POST, PATCH, DELETE) are supported for each endpoint.
• Corrections:
  • Removed non-existent /vstatus.
  • Marked /time as Not Yet Implemented (❌) (data is currently only read via /status).
• Implementation Status:
  • ✅ Fully Supported: Endpoints with complete wrapper methods.
  • ❌ Not Yet Implemented: Planned features like /time, /logs, /emeter reset, and /tesla integration.
• Descriptions: Improved descriptions to explain exactly what each endpoint is used for.

This update provides the most accurate and up-to-date view of the library's capabilities.

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Reviewing files that changed from the base of the PR and between 21d0373 and fb2784f.

📒 Files selected for processing (1)

• README.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/api-coverage-table

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