Add schemas and paths to link a User to an Org. This link is called an org membership.
An org membership has a role, which can be used to allow the users to perform different actions.
~The org membership includes the property permissions for more fine-grained permission control~ (multi-level schemas create different issues so keeping the org membership schema simple)
Based on GitHub "org-membership" schema
TODO
[x] Enable to filter permission per user and organization
Fixes #157
Notes
permissionsfor more fine-grained permission control~ (multi-level schemas create different issues so keeping the org membership schema simple)TODO