docs: add project documentation files

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

docs/README.md

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+# Excel & CSV Data Cleaning Mastery Bundle
+
+**Ready-to-sell Python automation product.**
+9 scripts for data cleaning, deduplication, text hygiene, formatting, merging, validation, and reporting.
+
+Each script ships with both a GUI (runs in your browser locally, no internet needed) and a CLI.
+
+Cross-platform: Windows, macOS, Linux.
+
+---
+
+## Quick Start (for buyers)
+
+1. Download the installer for your operating system.
+2. Run the installer. No Python knowledge required.
+3. Launch via the desktop shortcut "Launch Bundle" (or the app icon on macOS, or the AppImage on Linux).
+4. Your default browser opens to a local page where the data tool runs. Your data never leaves your computer.
+
+Full instructions: see [USER-GUIDE.md](USER-GUIDE.md).
+
+---
+
+## Documentation Index
+
+### Ships with the product (buyer-facing)
+- [USER-GUIDE.md](USER-GUIDE.md) - Installation, script reference, usage examples for both GUI and CLI.
+
+### Creator-only (do not ship to buyers)
+- [BUSINESS.md](BUSINESS.md) - Business case, market analysis, pricing, marketing strategy (including the hosted browser demo as a conversion lever).
+- [TECHNICAL.md](TECHNICAL.md) - Architecture (dual CLI + Streamlit GUI), build pipeline, dev standards.
+- [DECISIONS.md](DECISIONS.md) - Locked criteria, scoring rubric, decisions log, rationale for product choices including the GUI framework decision.
+- [RECOVERY.md](RECOVERY.md) - How to rebuild the entire project from scratch if lost.
+
+---
+
+**Version**: 1.6
+**Last updated**: April 28, 2026
+**Owner**: Michael