Post new video endpoint

[RbAvci]

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

HTTP Method: POST

Route: /api/videos

Acceptance Criteria

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