Add project README with overview, tech stack, and running instructions.

README.md

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+# Eigen HRIS
+
+## Project Overview
+Eigen HRIS is a modern, human‑centric Human Resource Integration System. It records employee data, contract history, daily attendance (WFO/WFH), leaves, permits, and provides a unified dashboard for analytics and gamified leaderboards (e.g., top attendance streaks, early birds, chronic latecomers, night owls).
+
+## Tech Stack
+- **Framework**: Next.js (App Router) – server actions & route handlers
+- **Styling**: TailwindCSS with custom design tokens and Tailwind Animate
+- **Icons**: Lucide React (replaces emojis throughout the UI)
+- **Data Storage**: CSV files under `/data/*.csv` accessed via a thin Node.js CSV‑DB layer (`src/lib/csv-db.ts`).
+- **Package Manager**: Yarn (Berry) – all dependencies are managed via `yarn`.
+- **Avatar Generation**: Online avatar services (DiceBear, Pravatar, Unsplash, UI‑Avatars) with live preview.
+- **File Uploads**: Multipart upload API (`/api/upload`) stores evidence files in `public/uploads/` for instant view/download.
+
+## Running the Project
+```bash
+# 1. Install dependencies (Yarn)
+yarn install
+
+# 2. Start the development server
+yarn dev
+
+# 3. Build for production
+yarn build
+
+# 4. Start the production server
+yarn start
+```
+The app will be available at `http://localhost:3000`. Ensure the `data/` CSV files are present (they are seeded by default) and that the `public/uploads/` folder is writable for file uploads.