docs: add README with production and development setup instructions

README.md

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+# Porchlight
+
+OpenID Connect Provider with user management, built with FastAPI.
+
+Porchlight handles user registration (via magic links), credential management
+(passwords and WebAuthn security keys), and issues OIDC tokens for relying
+parties. It uses SQLite for storage, Jinja2 + HTMX for the UI, and idpyoidc
+for the OIDC protocol layer.
+
+## Production Setup
+
+### Docker (recommended)
+
+```bash
+docker compose --profile prod up --build
+```
+
+This starts Porchlight on port 8000 with 4 uvicorn workers. Data is persisted
+in a named Docker volume.
+
+Set required environment variables in `docker-compose.yml` or via `.env`:
+
+```bash
+OIDC_OP_ISSUER=https://auth.example.com
+OIDC_OP_SESSION_SECRET=<random-secret>
+```
+
+### Manual
+
+Requires Python 3.13+ and [uv](https://docs.astral.sh/uv/).
+
+```bash
+uv sync --no-dev
+
+OIDC_OP_ISSUER=https://auth.example.com \
+OIDC_OP_SESSION_SECRET=$(python -c "import secrets; print(secrets.token_hex(32))") \
+  uv run uvicorn fastapi_oidc_op.app:create_app \
+    --factory --host 0.0.0.0 --port 8000 --workers 4
+```
+
+### Configuration
+
+All settings are read from environment variables with the `OIDC_OP_` prefix:
+
+| Variable | Default | Description |
+|---|---|---|
+| `OIDC_OP_ISSUER` | **required** | OIDC issuer URL (must match public URL) |
+| `OIDC_OP_SESSION_SECRET` | random per process | Session cookie signing secret |
+| `OIDC_OP_DEBUG` | `false` | Enable `/docs` Swagger UI |
+| `OIDC_OP_SQLITE_PATH` | `data/oidc_op.db` | SQLite database path |
+| `OIDC_OP_SIGNING_KEY_PATH` | `data/keys` | OIDC signing key storage |
+| `OIDC_OP_INVITE_TTL` | `86400` | Magic link expiry in seconds |
+| `OIDC_OP_MANAGE_CLIENT_ID` | `manage-app` | Client ID for the management UI |
+
+Database migrations run automatically on startup.
+
+## Development Setup
+
+### Prerequisites
+
+- Python 3.13+
+- [uv](https://docs.astral.sh/uv/)
+- Node.js (for e2e tests)
+
+### Getting started
+
+```bash
+# Install dependencies (including dev tools)
+uv sync
+
+# Start the dev server with hot reload
+OIDC_OP_ISSUER=http://localhost:8000 OIDC_OP_DEBUG=true \
+  uv run uvicorn fastapi_oidc_op.app:create_app \
+    --factory --host 127.0.0.1 --port 8000 --reload --reload-dir src
+```
+
+Or with Docker:
+
+```bash
+docker compose --profile dev up --build
+```
+
+### Running tests
+
+```bash
+# Unit/integration tests
+uv run pytest
+
+# Lint and format
+uv run ruff check src/ tests/ --fix
+uv run ruff format src/ tests/
+
+# Type checking
+uv run ty check src/
+```
+
+### End-to-end browser tests
+
+The e2e suite uses Playwright (Node.js) to test all user-facing flows against a
+running instance of the app.
+
+```bash
+# One-time setup: install Playwright and Chromium
+cd tests/e2e
+npm install && npm run setup
+cd ../..
+
+# Run all e2e tests
+./tests/e2e/run.sh
+
+# Run a specific test
+./tests/e2e/run.sh tests/e2e/test_login.js
+
+# Run with visible browser (not headless)
+E2E_HEADLESS=0 ./tests/e2e/run.sh
+```
+
+The runner starts the app on port 8099, seeds test fixtures into a temporary
+SQLite database, runs all `test_*.js` files, and tears everything down.
+
+### Full quality check
+
+```bash
+uv run ruff format src/ tests/
+uv run ruff check src/ tests/ --fix
+uv run ty check src/
+uv run pytest
+./tests/e2e/run.sh
+```