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+# Simple Markdown Viewer
+
+A tiny Node.js app that serves **all** markdown (`.md`) files in the workspace with a two‑pane UI:
+
+- **Left pane** – a collapsible directory tree.
+- **Right pane** – the selected markdown rendered to HTML.
+
+## Features
+- Auto‑detects directories and markdown files.
+- Click a folder to expand/collapse.
+- Click a file to view it instantly.
+- Runs on **port 8100** (http://localhost:8100).
+- No build step – just `npm install` and `npm start`.
+
+## Install & Run
+```bash
+cd /viewer
+npm install   # installs express & markdown-it
+npm start
+```
+Open your browser at `http://localhost:8100`.
+
+The server serves the whole workspace (the parent of the `viewer` folder) as the markdown root, so you can browse any `.md` file, e.g. `Projects/POS/ICP.md`.
+
+## Files
+- `server.js` – Express backend with two APIs (`/api/tree` and `/api/md`).
+- `public/` – static HTML/CSS/JS for the UI.
+- `package.json` – npm metadata.
+
+Enjoy!