UI | Attachments list

[kacper-cyra]

Figma: https://www.figma.com/file/UOqXCGxVb1fjY7pWUzvI8K/Thullo---Trello-Clone?node-id=1%3A879

• [x] Should receive: list of attachments, on add handler, on delete handler
• [x] Should pass on delete handler to each Attachment component
• [x] Should trigger on add handler when add button was pressed

Blockers: #9