Post new video endpoint

[PERicci]

From Full-Stack-Project-Assessment created by Dedekind561: CodeYourFuture#471

HTTP Method: POST

Route: /api/videos

Acceptance Criteria

• There is a POST /api/videos backend endpoint to facilitate adding videos to the database.
• The endpoint generates and attaches a unique ID to each newly added video.
• The endpoint accepts video data in JSON format (example provided).
• The endpoint responds with a JSON response that includes the generated id (example provided)

[PERicci]

Pull request: #30