Components - Added the pipeline component repository marker file (#3883)
Components - Added the pipeline component repository marker file (#3883)

Added a marker file that marks the location of a repository of Kubeflow Pipelines components.
This marker file makes it easier to find public repositories online.
kubeflow/pipelines,kubeflow/pipelines,kubeflow/pipelines,kubeflow/pipelines,kubeflow/pipelines,kubeflow/pipelines