I installed the plugin planning as it is on the site, but when I run superdesk the same does not appear "content api" to use planning ... who can help me
The Planning component is a work in progress, we haven't released yet any version (not even an alpha), especially because up until now we have focused on all the ground work and we haven't yet started the integration with Superdesk.
If you are interested on helping out with the development, it'd be very much welcome, otherwise please stay tuned for upcoming releases.