Add curl examples to the devdocs

[micbar]

Is your feature request related to a problem? Please describe.

As a consumer of the oCIS dev docs i want to know more about api calls

Describe the solution you'd like

Add more curl examples to the dev docs

Describe alternatives you've considered

none

Additional context

This will be important for beta testers

List of interesting APIs

• [ ] Drives
• [x] Users (https://github.com/owncloud/ocis/pull/3149)
• [x] Groups (https://github.com/owncloud/ocis/pull/3149)
• [x] WebDAV Spaces Endpoints
• [ ] Share OCS (add people to spaces)
• [ ] Permissions and Roles API

[micbar]

@phil-davis @pmaier1 @dragotin FYI

[saw-jan]

• [ ] Share OCS (add people to spaces)

do we still need to do it?

[micbar]

• [ ] Share OCS (add people to spaces)

do we still need to do it?

Not needed anymore.