Add a docker-compose & let's encrypt user-guide

docs/content/user-guides/docker-compose/basic-example/docker-compose.yml

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+version: "3.3"
+
+services:
+
+  traefik:
+    image: "traefik:v2.0.0-beta1"
+    container_name: "traefik"
+    command:
+      #- "--log.level=DEBUG"
+      - "--api=true"
+      - "--providers.docker=true"
+      - "--providers.docker.exposedbydefault=false"
+      - "--entrypoints.web.address=:80"
+    ports:
+      - "80:80"
+      - "8080:8080"
+    volumes:
+      - "/var/run/docker.sock:/var/run/docker.sock:ro"
+
+  whoami:
+    image: "containous/whoami"
+    container_name: "simple-service"
+    labels:
+      - "traefik.enable=true"
+      - "traefik.http.routers.whoami.rule=Host(`whoami.localhost`)"
+      - "traefik.http.routers.whoami.entrypoints=web"