Add Docker dev environment and initial code

docker-compose.yml

@@ -0,0 +1,18 @@
+version: '3'
+
+services:
+  backend:
+    build:
+      context: .
+      dockerfile: Dockerfile.dev
+      args:
+        # Use an ".env" file to overwrite this variable if your local user's UID is not 1000.
+        DEV_USER_UID: ${DEV_USER_UID:-1000}
+    ports:
+      - '8080:8080'
+    volumes:
+      - ./:/app/
+    command: gunicorn --bind=0.0.0.0:8080 --reload tofu_api.app:app
+
+volumes:
+  mariadb_data: