Create README.md

Author: ajeetraina

workshop/dockerdesktop/mac/architecture/README.md

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+- Docker uses containerd under the hood to run containers
+- Containerd is a container runtime that manages the lifecycle of a container on a physical or virtual machine (a host)
+- It manages the complete container lifecycle of its host system! 
+- This includes pulling and pushing images as well as handling the starting and stopping of containers. 
+
+
+```
+$ docker run --name web -p 80:80 -d nginx
+```
+
+- Docker CLI understands what we want to do, and then sends instructions to containerd.
+- containerd does its magic, downloads the nginx image if it's not available.
+- Next, containerd tells runc to start this container
+- And we finally get our result: nginx running in a little isolated container box.
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