Add visualization from view.commonwl.org

Author: mr-c

_episodes/21-1st-workflow.md

@@ -23,6 +23,8 @@ compiles it.
 ~~~
 {: .source}
 
+<a href="https://view.commonwl.org/workflows/github.com/common-workflow-language/user_guide/blob/gh-pages/_includes/cwl/22-nested-workflows/1st-workflow.cwl"><img src="https://view.commonwl.org/graph/svg/github.com/common-workflow-language/user_guide/blob/gh-pages/_includes/cwl/22-nested-workflows/1st-workflow.cwl" alt="Visualization of 1st-workflow.cwl" /></a>
+
 Use a JSON object in a separate file to describe the input of a run:
 
 *1st-workflow-job.yml*