[IMP] tutorials/server_framework_101: add warning about access rights

When readers follow the server framework 101 tutorial, it's common for them
to set the model access rights the same as in the tutorial's example at
chapter 4. Following this example they will have read only permissions and
by chapter 6 they will not be able to create/update or delete objects in
order to follow with the tutorial.

This commit adds a warning for readers to remind them of the relation between
the access rights set previously and what they can see and do using the UI.

closes #12237

Signed-off-by: Antoine Vandevenne (anv) <[email protected]>

Author: nimbo1000

content/developer/tutorials/server_framework_101/06_basicviews.rst

@@ -66,6 +66,12 @@ to see the result.
     You will probably use some copy-paste in this chapter, therefore always make sure that the ``id``
     remains unique for each view!
 
+
+.. warning::
+   Remember to set the correct access rights to the user as explained in the :doc:`security intro <04_securityintro>`!
+
+   The :guilabel:`Create` button is not shown if the user has only read permission.
+
 Form
 ====