USER STORY: Add interested to event

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As a logged in user I can add interested to a post so that I can publicly display my interest in an event

Acceptance Criteria:

• Acceptance Criteria 1: Interested button under all event posts
• Acceptance Criteria 2: Interested button active only when user logged in
• Acceptance Criteria 3: If user not logged in, message on hover tells them they must be logged in to post an interest in an event
• Acceptance Criteria 4: Adding interested increases total interested count for that event

Tasks:

• [ ] Design - interested button and icon
• [ ] Create HTML, CSS, JSX - set up authentication against logged out users
• [ ] Create API requests - Post interested instance to interested table
• [ ] Test completed functionality