Assign Set: Modal

[alexrcabral]

Full Mockup

Assign Set Modal

When the Assign Set button is clicked in v2, this is the Assign Problem Set modal which should come up, This is based on the Share Problem Set modal from v1, and should behave in the same way. 

Alt Texts: 

• "Copy Link" 
• "Google Classroom" 
• "Microsoft Teams" 
• "Close" 

Acceptance criteria: 

Given that I'm a user on the problem creation page, when I press the button to assign set, this should save any progress I've made on the set, and open the assign set modal. if I click the text box containing the URL, this should highlight the entire link for ease of copying. If I press copy link, this should copy to my clipboard. If I press Google Classroom or Microsoft Teams, this should open sharing through the appropriate LMS. If I press Close, this should close the modal, and return me to where I left off in the problem set. 

[abaranowska1]

Tested
@rupeshparab I guess that the Assign Set modal should be named "Assign Problem Set", now I can see "Share Problem Set"

[rupeshparab]

Updated the title

[abaranowska1]

Confirm that the title is updated to "Assign Problem Set"