**As** an admin
**I want to** configure an external xwiki instance as a wiki integration
**so that** this wiki can be used within projects 

**Acceptance criteria**

* A wiki integration of type XWiki must be creatable, editable and delable.

* The admin must be able to connect to a wiki on an xwiki instance by URL.

* If the URL is invalid or doesn't point to a valid xwiki instance, a validation error is shown.

* The admin must be able to Begin of the insertionselect any subset of eligable wikis from the xwiki instance.

* The admin must be able toEnd of the insertion configure an authentication strategy.

* bidirectional OAuth2 Begin of the insertion

End of the insertion Begin of the deletion

End of the deletion * Begin of the insertioncommon OIDC

End of the insertion Begin of the deletion needs clarification if XWiki can act as an OAuth2 provider

End of the deletion * Begin of the deletion commonEnd of the deletion OIDC Begin of the insertionmust work with and without token exchangeEnd of the insertion