Add README

Repo landing page with overview, install, usage, file map, and roadmap.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

README.md

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+# AutoACCT — Bookkeeping Skill for Claude Code
+
+A [Claude Code](https://claude.com/claude-code) skill that turns a receipt image (optionally with a caption) into a structured row in a Google Sheet, with automatic HKD conversion.
+
+Intended to be invoked manually inside Claude Code today, and wired up to a WhatsApp webhook later.
+
+## What it does
+
+1. Reads a receipt / invoice / payment-screenshot image via vision.
+2. Extracts: date, merchant, category, amount, currency, payment method, line items, raw OCR, caption note.
+3. Converts the amount to **HKD** at that day's ECB reference rate via [frankfurter.app](https://frankfurter.app) (free, no API key).
+4. Appends one row to a configured Google Sheet (14 columns — see `schema.md`).
+5. Replies with the row and flags any field it had to guess.
+
+## Install
+
+Clone into your Claude Code skills directory:
+
+```bash
+git clone https://git.deepknow.site/Knowit/AutoACCT.git ~/.claude/skills/bookkeeping
+```
+
+Then follow [`scripts/setup.md`](scripts/setup.md) for the one-time setup:
+
+- Python deps: `pip install google-api-python-client google-auth`
+- Create a GCP service account + download its JSON key
+- Create a Google Sheet, add 14 header columns, share with the service account email
+- `cp config.example.json config.json` and fill in `sheet_id` + `service_account_path`
+
+## Use
+
+In a Claude Code session, drop a receipt image in and say "log this" (or similar). The skill auto-triggers on receipt-image requests — no slash command needed.
+
+Caption is optional; use it to add context (payment method, split, category hint, free-text note).
+
+## Files
+
+| File                  | Purpose                                           |
+|-----------------------|---------------------------------------------------|
+| `SKILL.md`            | Entry — Claude reads this to invoke the skill     |
+| `categories.md`       | Fixed category list (14 categories)               |
+| `schema.md`           | Google Sheet column order (A–N)                   |
+| `config.example.json` | Template → copy to `config.json` (gitignored)     |
+| `scripts/fx_convert.py` | Currency → HKD via frankfurter.app              |
+| `scripts/append_row.py` | Writes one row to Google Sheets                 |
+| `scripts/setup.md`    | One-time setup steps                              |
+
+## Roadmap
+
+- [ ] WhatsApp webhook layer (Meta Cloud API or Twilio) so images can be sent from a phone.
+- [ ] Optional Google Drive upload so the `Receipt` column becomes a clickable image link.
+- [ ] Monthly summary script (totals by category, currency breakdown).
+
+## License
+
+Private — internal use.