Fix readme.

README.md

+# My Blog
+
+## How add to swarm
+
+Make sure the overlay network is created
+
+Deploy the service
+
+```
+docker service create \
+	--name my-blog \
+	--constraint 'node.role == worker' \
+	--network internal-network \
+	registry.dbogatov.org/dbogatov/my-blog:latest
+```
+