User story:

Я как пользователь хочу закреплять добавленные мной ссылки за моим пользователем, для того чтобы потом легко найти

0) changes/additions proposed with this issue and what they are provided for

we need a field to identify the user making request for a link edition/removal with archiving
the best way is to add an appropriate field to the model
the name of such a field could be 'owner'

1) objects changing or adding to the project

add a String field to Link model
add a String field to SaveLinkRequest model

2) API annotations provided with changes/additions required

    @ApiModel 
    public class Link 

    @ApiModelProperty(value = "A person who saves this link, used to identify while changing/archiving", required = true)
    public String getOwner()

3) Process (or may be USAGE???) description, examples To be sure if the person, who makes request, has the rights to change/archive the link, we need their user id to be compared with id of a person, who has created this link before.

4) requirements and limitations

The field has to be non-null
This model property is required
Tests written for Link and SaveLinkRequest should include provided field

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