curl "https://api.phrase.com/v2/projects/:project_id/screenshots" \
  -u USERNAME_OR_ACCESS_TOKEN \
  -X POST \
  -F branch=my-feature-branch \
  -F name=A%20screenshot%20name \
  -F description=A%20screenshot%20description \
  -F filename=@/path/to/my/screenshot.png

{
  "id": "d2e056aa9e70b01121f41693e344f5ee",
  "name": "A screenshot name",
  "description": "A screenshot description",
  "screenshot_url": "http://assets.example.com/screenshot.png",
  "created_at": "2015-01-28T09:52:53Z",
  "updated_at": "2015-01-28T09:52:53Z",
  "markers_count": 0
}