add motivation

Author: mr-c

docs/computing/running/toil-cwl-runner

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+# Running CWL workflows on Puhti with `toil-cwl-runner`
+
+[Common Workflow Language](https://www.commonwl.org/) is a popular set of open standards implemented by several workflow runners and platforms.
+The CWL standards are targeted at creating portable workflows made of command line programs. The steps can be written in any compiled or interpreted language.
+Sub-workflows, optional steps, scatter-gather, and implicit parallelism are just some of the features.
+
+The [Toil workflow system](https://toil.ucsc-cgl.org/) supports running CWL on a variety of schedulers and systems.
+
+This page describes how run CWL worklflows on Puhti using `toil-cwl-runner`, including the usage of `apptainer` to execute any provided Docker-format containers.
+
+## Strengths of the Common Workflow Language standards
+
+## Strengths of `toil-cwl-runner`
+
+## Disadvantages for using CWL
+
+## Disadvantages for using `toil-cwl-runner`
+
+## Installing `toil-cwl-runner`
+
+(and nodejs)
+
+## Defining CWL workflows
+
+(link to existing docs)
+
+## Running CWL workflows with `toil-cwl-runner`
+
+(use sbatch to submit toil-cwl-runner job to submit further jobs)
+
+## Monitoring a running workflow