admin can copy the link for students to access the roster

[gbarkin]

This story is for an admin user to copy the url for the classroom.

As an admin user
I want access to the class room URL
So that I can share that URL with students to login

AC 1 - Admin can copy the URL for the classroom
Given an Admin has created a school
And the admin has created a classroom for that school
When the Admin navigates to the classroom details
Then the admin is able to copy a URL for students to login