Consolidate project documentation into a single root README

README.md

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+# Riot_web
+
+Riot_web is a full-stack web project with:
+
+- **front/**: React + Vite frontend (landing pages and UI)
+- **backend/**: Node.js + Express API backend
+
+## Project Structure
+
+```text
+Riot_web/
+├── front/
+└── backend/
+```
+
+## Prerequisites
+
+- Node.js 16+ (18+ recommended)
+- npm
+
+## Run Frontend
+
+```bash
+cd front
+npm install
+npm run dev
+```
+
+Frontend scripts:
+
+- `npm run dev` - Start Vite development server
+- `npm run build` - Build production assets
+- `npm run lint` - Run ESLint
+- `npm run preview` - Preview production build locally
+
+## Run Backend
+
+```bash
+cd backend
+npm install
+npm run dev
+```
+
+Backend scripts:
+
+- `npm run start` - Start API server with Node.js
+- `npm run dev` - Start API server with nodemon
+- `npm run data:import` - Import seed data
+- `npm run data:destroy` - Destroy seed data
+
+## Notes
+
+- The backend `npm test` script is currently a placeholder and exits with an error by default.
+- Frontend and backend can be developed independently in separate terminals.