Add endpoints for current user and support for profile pictures

[oscarli00]

Description

Adds 2 new endpoints:

• GET /api/v1/users/current
  • should return the current user
  • will have the same data as GET /api/v1/users/:id but may be extended further later
• PUT /api/v1/users/current
  • updates user information
  • user should be able to update:
    • username
    • profile picture
    • email
    • password

Extended both GET /api/v1/users/current and GET /api/v1/users/:id to also return profile picture Profile pictures are stored in /uploads Users can get profile pictures from localhost:4200/uploads/{imageName}

Fixes/resolves #96

Type of change

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• [x] New feature (non-breaking change which adds functionality)
• [x] This change requires a documentation update

Checklist:

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