Create endorsement feature that allows TAs and Teachers to "endorse" student answers and bring the question response closer to the top (since it could be more helpful to students)

[tikakumar]

• Estimated effort - Easy/Moderate
• Dependencies among tasks - None
• Assignment - Grace
• Milestones to indicate which sprint the issue should be completed in - Sprint 1
• Acceptance criteria that describes how you know this task is done - Checking if endorsements show on both teacher and student profile, multiple endorsements work, TAs must clarify in order to endorse but Teachers can just endorse, endorsements are highest in question-student forum
• PR : #22