Adding the specification for the API of Workflow manager

[iRohitSingh]

[mister-roboto]

@iRohitSingh thanks for creating this Pull Request and helping to improve Plone!

TL;DR: Finish pushing changes, pass all other checks, then paste a comment:

@jenkins-plone-org please run jobs

To ensure that these changes do not break other parts of Plone, the Plone test suite matrix needs to pass, but it takes 30-60 min. Other CI checks are usually much faster and the Plone Jenkins resources are limited, so when done pushing changes and all other checks pass either start all Jenkins PR jobs yourself, or simply add the comment above in this PR to start all the jobs automatically.

Happy hacking!

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[iRohitSingh]

@robgietema can you please review and give feedback about this.

[jensens]

Just some remarks here:

• plone.app.workflowmanager is an addon - it is neither a dependency of Products.CMFPlone (core) nor of the Plone package
• I tend to suggest to not add this endpoint to plone.restapi, but keep it within plone.app.workflowmanager package.