Add docker compose example (#144)

* Add docker compose example

* compose: healthcheck and restart policy

* Update README.md

docker-compose.yml

@@ -0,0 +1,10 @@
+services:
+  yt-dlp-webui:
+    image: marcobaobao/yt-dlp-webui
+    ports:
+      - 3033:3033
+    volumes:
+      - <your dir>:/downloads # replace <your dir> with a directory on your host system
+    healthcheck:
+      test: curl -f http://localhost:3033 || exit 1
+    restart: unless-stopped