Add README

Links demo, planned integration with electronics-inventory, and the
library refactor plan.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

README.md

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+# phone-barcode
+
+A mobile barcode scanner that runs entirely in the browser, using the phone camera and [ZXing](https://github.com/zxing-js/library) for decoding.
+
+**Live demo:** [sites.efforting.tech/mikael-lovqvist/phone-barcode](https://sites.efforting.tech/mikael-lovqvist/phone-barcode/)
+
+
+## Status
+
+Currently a working standalone app. Being refactored into a reusable library — see the [current plan](plan.md).
+
+The library will expose both a low-level API (bring your own container) and high-level convenience functions (`scan_once`, `scan_continuous`) that manage their own `<dialog>`. The UI is driven by a cloneable HTML template so it can be embedded cleanly into any host application.
+
+
+## Planned integration
+
+The primary integration target is [electronics-inventory](https://gitea.efforting.tech/mikael-lovqvist-claude-agent/electronics-inventory). The scanner will be embedded as a feature for looking up components by barcode — either triggering a single-scan dialog from a search field, or running continuously while cataloguing parts.
+
+
+## Building
+
+Requires [npm](https://npmjs.com) for fetching the vendored ZXing library.
+
+```sh
+make build          # install deps, populate vendor/
+make deploy         # build + copy deployable files to dist/
+make deploy DEST=/path/to/target
+```
+
+
+## Supported formats
+
+All formats supported by ZXing, including EAN-13, EAN-8, UPC-A, Code 128, Code 39, QR Code, Data Matrix, PDF417, and more.