docs: add documentation index

docs/README.md

@@ -0,0 +1,24 @@
+# ScanSlicer Docs
+
+This folder contains in-depth documentation for ScanSlicer.
+
+## Contents
+
+- `docs/user-guide.md`: How to use the application end-to-end.
+- `docs/architecture.md`: Module layout, responsibilities, and runtime flow.
+- `docs/parameters.md`: Detection parameter catalog (defaults, ranges, and effects).
+- `docs/autotune.md`: Auto-tune profiles, candidate search, scoring, and feedback learning.
+- `docs/runtime-config.md`: Backend selection, environment variables, and persistence paths.
+- `docs/appimage.md`: Local and Docker AppImage build workflows.
+- `docs/development.md`: Developer-oriented codebase and workflow notes.
+
+## Recommended Reading Order
+
+1. `README.md` (project overview and quick start)
+2. `docs/user-guide.md`
+3. `docs/parameters.md`
+4. `docs/autotune.md`
+5. `docs/architecture.md`
+6. `docs/runtime-config.md`
+7. `docs/appimage.md`
+8. `docs/development.md`