Add README, .gitignore, CI workflow, and syntax checks

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

README.md

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+# Wings of the 90s - Flight Simulator
+
+A period-accurate 3D flight simulator inspired by early 90s Amiga/DOS games like *Comanche*, *F-15 Strike Eagle*, and *After Burner*. Runs in any modern browser.
+
+## Features
+
+- **Authentic retro aesthetic** — 320×200 VGA Mode X resolution, CRT post-processing (barrel distortion, scanlines, color quantization, chromatic aberration, vignette), EGA 16-color palette
+- **Loading screen** with progress bar and cycling messages
+- **Main menu** with keyboard navigation
+- **Procedural terrain** — 2000m heightmap with vertex-colored hills, water plane, low-poly clouds
+- **Airport** — Runway with markings, taxiway, control tower, hangars, fuel truck, windsock
+- **Low-poly Cessna-style aircraft** with animated propeller and retractable landing gear
+- **6-DOF flight physics** — Thrust, drag, lift, gravity, ground friction, auto-leveling
+- **Flight HUD** — Artificial horizon, airspeed, altimeter, heading tape, vertical speed indicator, throttle bar
+- **Sound** — Engine drone tied to throttle, menu beeps
+
+## Controls
+
+| Key | Action |
+|---|---|
+| `W` / `S` | Throttle up / down |
+| `↑` / `↓` | Pitch |
+| `←` / `→` | Roll |
+| `Q` / `E` | Yaw (rudder) |
+| `C` | Toggle cockpit / chase camera |
+| `Esc` | Pause / resume |
+
+## Getting Started
+
+```bash
+npm install
+npm run dev
+```
+
+Open `http://localhost:5173` in your browser.
+
+## Build
+
+```bash
+npm run build
+```
+
+## Tech Stack
+
+- Three.js r160 for 3D rendering
+- Vite for dev server and builds
+- Vanilla JS, no frameworks
+- Web Audio API for sound