RSN-10 Create DTOs

[mkoper02]

No description provided.

[mkoper02]

As suggested, I changed the following things:

• Name of the Created parameter to CreatedAt in CommentDto class,
• Fixed spelling in class ParticipantDto,
• Added UpdatedAt and CreatedAt in EventDto class,
• For UserDto class I changed parameter Address (AddressDto type) to AddressId (int) and added list of intrests.

[mkoper02]

Next changes:

• Created new DTOs - RoleDto and TagDto,
• Added list of tags in EventDto,
• Changed State parameter from nullable to non-nullable in AddressDto.

[wzarek]

Seems fine, but having in mind naming conventions in C#, especially this one:

CONSIDER using plural namespace names where appropriate.

For example, use System.Collections instead of System.Collection. Brand names and acronyms are exceptions to this rule, however. For example, use System.IO instead of System.IOs.
~ from Names of Namespaces

I think it is more appropriate to use plural form since we can easily create a plural form from DTO and it will be Data Transfer Objects.
If you have any objections - let's discuss it :)

[wzarek]

Seems OK