Add docker compose file.

highscores_compose.yaml

@@ -0,0 +1,15 @@
+version: "3"
+services:
+  sqldb:
+    image: "highscores_db"
+    container_name: "Highscores-DataBase"
+    volumes:
+      - highscores_data:/var/lib/mysql
+    ports:
+      - 3306:3306
+    environment:
+      - MYSQL_ROOT_PASSWORD=${SQL_PASS}
+      - MYSQL_ROOT_USERNAME=${SQL_USER}
+
+volumes:
+  highscores_data: