Resources added for Docker swarm (#1499)

* Resources added for Docker swarm

* Update content/roadmaps/102-devops/content/105-infrastructure-as-code/104-docker-swarm.md

Co-authored-by: Kamran Ahmed <kamranahmed.se@gmail.com>

content/roadmaps/102-devops/content/105-infrastructure-as-code/104-docker-swarm.md

@@ -1 +1,8 @@
-# Docker swarm
+# Docker Swarm
+
+A Docker Swarm is a group of either physical or virtual machines that are running the Docker application and that have been configured to join together in a cluster. Once a group of machines have been clustered together, you can still run the Docker commands that you're used to, but they will now be carried out by the machines in your cluster. The activities of the cluster are controlled by a swarm manager, and machines that have joined the cluster are referred to as nodes.
+
+<ResourceGroupTitle>Free Content</ResourceGroupTitle>
+<BadgeLink colorScheme='blue' badgeText='Official Website' href='https://www.docker.com/'>Official Website</BadgeLink>
+<BadgeLink colorScheme='blue' badgeText='Documentation' href='https://docs.docker.com/engine/swarm/'>Docker Swarm Documentation</BadgeLink>
+<BadgeLink badgeText='Watch' href='https://www.youtube.com/watch?v=Tm0Q5zr3FL4'>Docker Swarm Tutorial for Beginners</BadgeLink>