docs: add project README

README.md

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+# House Plan Maker
+
+A web-based apartment and room planning tool with 2D editing, wall projections, and a 3D preview. Design rooms, place electrical fixtures and furniture, and export layouts as PDFs.
+
+## Features
+
+- **Apartment & room management** — organize multi-room apartments with per-room floor type, wall finish, ceiling, and plinth properties.
+- **2D editor** — draw walls, place doors/windows, add outlets/switches/cables and furniture on a Konva-powered canvas.
+- **Wall projections** — view and edit each wall elevation with accurate opening and electrical placement.
+- **3D view** — preview rooms in Three.js / React Three Fiber with materials, textures, and openings.
+- **Electrical elements** — outlets (with horizontal/vertical orientation), switches, wall cables, ceiling and wall lights.
+- **Furniture** — textured furniture items with projection onto wall elevations.
+- **PDF export** — export floor plans and wall projections via jsPDF.
+- **i18n** — English and Russian translations out of the box.
+
+## Tech Stack
+
+- **Monorepo**: npm workspaces + Turborepo
+- **Client**: React 19, Vite 6, React Router 7, Konva, React Three Fiber / Three.js, i18next
+- **Server**: Fastify 5, Prisma 6 (SQLite), Zod validation
+- **Shared**: TypeScript types and Zod schemas in `packages/shared`
+- **Tooling**: TypeScript, ESLint, Prettier, Vitest
+
+## Repository Layout
+
+```
+apps/
+  client/     # React + Vite frontend (2D editor, 3D view, PDF export)
+  server/     # Fastify API + Prisma (SQLite)
+packages/
+  shared/     # Shared types and Zod schemas
+```
+
+## Getting Started
+
+### Prerequisites
+
+- Node.js 20+
+- npm 10+
+
+### Install
+
+```bash
+npm install
+```
+
+### Database setup
+
+```bash
+cd apps/server
+npx prisma migrate dev
+cd ../..
+```
+
+Set `DATABASE_URL` in `apps/server/.env` (defaults to a local SQLite file at `apps/server/prisma/dev.db`).
+
+### Run in development
+
+```bash
+npm run dev
+```
+
+This starts both client (Vite) and server (tsx watch) via Turborepo. The client is served on the Vite dev port and proxies API calls to the Fastify server.
+
+### Build
+
+```bash
+npm run build
+```
+
+### Test & lint
+
+```bash
+npm test
+npm run lint
+npm run format
+```
+
+## Data Model (summary)
+
+- **Apartment** → has many **Rooms**
+- **Room** → has **Walls**, **WallOpenings** (doors/windows), **ElectricalItems**, **FurnitureItems**, **Annotations**
+- Stretch-ceiling, plinth, wall color/finish, and floor type are configured per room.
+
+See [apps/server/prisma/schema.prisma](apps/server/prisma/schema.prisma) for the full schema.
+
+## API
+
+The Fastify server exposes REST routes under:
+
+- `/apartments`
+- `/rooms`
+- `/elements` (walls, openings, electrical, furniture, annotations)
+
+Request/response shapes are validated with Zod schemas from `@house-plan-maker/shared`.
+
+## License
+
+Private / unlicensed. Internal project.