Initialize guideCity monorepo scaffolding

Set up git repo with .gitignore and README describing the planned
backend (FastAPI + PostGIS) and Android (Kotlin/Compose) architecture.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

.gitignore

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+# Environment
+.env
+*.env
+!.env.example
+
+# Python
+__pycache__/
+*.py[cod]
+*.egg-info/
+.venv/
+venv/
+.pytest_cache/
+.mypy_cache/
+.ruff_cache/
+
+# Docker
+docker-compose.override.yml
+
+# Android / Gradle
+android/local.properties
+android/.gradle/
+android/**/build/
+android/.idea/
+android/*.iml
+android/.cxx/
+android/captures/
+android/.externalNativeBuild/
+*.keystore
+*.jks
+
+# IDE
+.vscode/
+.DS_Store
+
+# Logs
+*.log

README.md

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+# guideCity
+
+Android walking city-guide app. Detects the user's location, finds nearby
+landmarks, and narrates historical/architectural information about them by
+voice while showing a swipeable card stack. Starting city: Moscow.
+
+## Architecture
+
+```
+                 ┌────────────────────┐
+                 │   Android app      │  Kotlin + Jetpack Compose
+                 │  (android/)        │  2GIS map, on-device TTS,
+                 └─────────┬──────────┘  location, Room favorites
+                           │ HTTPS / REST (JSON)
+                 ┌─────────▼──────────┐
+                 │   FastAPI backend   │  Python, SQLAlchemy, Alembic
+                 │   (backend/)        │  Dockerized
+                 └─────────┬──────────┘
+                           │ SQL
+                 ┌─────────▼──────────┐
+                 │ PostgreSQL+PostGIS  │  cities / places / place_content
+                 └────────────────────┘
+```
+
+- `backend/` — FastAPI service exposing city/place/nearby-search endpoints,
+  backed by PostgreSQL+PostGIS. See `backend/` for details.
+- `android/` — Kotlin/Compose app skeleton (MVVM, Hilt, Retrofit, Room,
+  DataStore, 2GIS MapKit, on-device TextToSpeech).
+
+## Backend quickstart
+
+```bash
+cp .env.example .env
+docker compose up -d db
+docker compose exec api alembic upgrade head   # (once api image is built: docker compose up -d --build api adminer first)
+docker compose exec api python -m seed.seed_loader --file seed/moscow_gorky_park.yaml
+docker compose exec api python -m seed.seed_loader --file seed/moscow_red_square.yaml
+docker compose exec api python -m seed.seed_loader --file seed/moscow_city.yaml
+curl http://localhost:8000/api/v1/health
+curl "http://localhost:8000/api/v1/nearby?lat=55.7525&lon=37.6231"
+```
+
+Swagger UI: http://localhost:8000/docs
+Adminer (DB inspection): http://localhost:8080
+
+## Android quickstart
+
+```bash
+cp android/local.properties.example android/local.properties
+# fill in sdk.dir and DGIS_API_KEY (test key: b4df01a8-61db-4cb9-8286-7e069495987d)
+cd android && ./gradlew :app:assembleDebug
+```
+
+Point the app's API base URL at `http://10.0.2.2:8000/` for the emulator, or
+your machine's LAN IP for a physical device.
+
+## Notes / current scope
+
+This is iteration 1: Moscow only (Gorky Park, Red Square area, Moscow-City),
+no user accounts (favorites are local/Room-only), no speed/heading-aware
+auto content-length selection yet (reserved API params exist, unused).
+
+The 2GIS API key above is used directly via `local.properties`/`BuildConfig`
+for development convenience — don't ship it as-is in a public repo.