docs: add deployment repo README

public/README.md

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+# SeedPGP Web App
+
+**Secure BIP39 mnemonic backup tool using PGP encryption**
+
+🔗 **Live App**: https://kccleoc.github.io/seedpgp-web-app/
+
+## About
+
+This is a client-side web application for encrypting cryptocurrency seed phrases (BIP39 mnemonics) using OpenPGP encryption and Base45 encoding for QR code generation.
+
+### Features
+
+- 🔐 PGP encryption with cv25519 (Curve25519)
+- 📱 QR code-ready output (Base45 + CRC16)
+- ✅ Supports 12/18/24-word BIP39 mnemonics
+- 🔒 All encryption happens in your browser (client-side only)
+
+## Security Notice
+
+⚠️ **Your private keys and seed phrases never leave your browser**
+
+- This is a static web app with no backend server
+- All cryptographic operations run locally in your browser
+- No data is transmitted to any server
+- Always verify you're on the correct URL before use
+
+### For Maximum Security
+
+For production use with real funds:
+- Download and run locally
+- Or use a self-hosted version
+- Source code: https://github.com/kccleoc/seedpgp-web
+
+## How to Use
+
+1. **Encrypt**: Enter your mnemonic + PGP public key → Get QR code
+2. **Decrypt**: Scan QR code + provide private key → Recover mnemonic
+
+## Version
+
+Current deployment: **v1.1.0**
+
+Last updated: 2026-01-28
+
+---
+
+Built with TypeScript, React, Vite, and OpenPGP.js v6
+