Add READMEs to ark nova (#286)

ark_nova_stats/README.md

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+# ark_nova_stats
+
+A collection of tools and services for analyzing Ark Nova games.
+
+See the README.md in individual directories.
+
+## API
+
+This is a webapp designed to store Ark Nova replays, in BGA format.
+
+To run, do:
+```bash
+docker compose -f docker-compose.yaml -f docker-compose.override.yaml up
+```
+
+To deploy to production:
+
+```bash
+cd api
+fly deploy
+```
+
+## bga_log_parser
+
+A Python library used to parse Ark Nova gameplay logs in BGA format.
+
+## emu_cup
+
+A set of scripts I'm using to analyze replays from the Emu Cup, an Ark Nova tournament between high-ranked players on BGA.

ark_nova_stats/bga_log_parser/README.md

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+# bga_log_parser
+
+A Python library to parse Ark Nova gameplay logs in BGA format.
+
+First, download the gameplay logs in JSON format somewhere on your computer. Then:
+
+```python
+import json
+from ark_nova_stats.bga_log_parser.game_log import GameLog
+
+with open('path/to/my/replay.json', 'r') as f:
+    log = GameLog(**json.loads(f.read().strip()))
+
+print(log.winner)
+```