Send/Receive photos on Backend

## Description
As a user of the Mentorship System,
I need to upload a picture identifying me,
so that I can be identified by other members of the system.

This requires saving the image and sending into Amazon S3 service, then sending the URL to the Backend using the PUT /user API

This requires a lot of discussion because of Amazon hosting.

## Acceptance Criteria
### Update [Required]
- [ ] Send the picture to Backend
- [ ] Receive and parse the image from Backend

## Definition of Done
- [ ] All of the required items are completed.
- [x] Approval by 1 mentor.

## Estimation
10 hours