add example docker-compose service definition for router

Signed-off-by: Phill Kelley <34226495+Paraphraser@users.noreply.github.com>

docker-compose-router.yml

@@ -0,0 +1,22 @@
+version: '3'
+services:
+  zerotier:
+    image: "zyclonite/zerotier:router"
+    container_name: zerotier-one
+    devices:
+      - /dev/net/tun
+    network_mode: host
+    volumes:
+      - '/var/lib/zerotier-one:/var/lib/zerotier-one'
+    cap_add:
+      - NET_ADMIN
+      - SYS_ADMIN
+      - NET_RAW
+    restart: unless-stopped
+    environment:
+      - TZ=Etc/UTC
+      - PUID=999
+      - PGID=994
+      - ZEROTIER_ONE_LOCAL_PHYS=eth0
+      - ZEROTIER_ONE_USE_IPTABLES_NFT=false
+    # - ZEROTIER_ONE_NETWORK_ID=yourNetworkID