Add details to new cards with @ + # for members, date, etc.

The creation of a new card could be much easier if the would be the possibility to add details in the text with specific characters. For examle:

• @user for the member
• #tag_1 #tag_2
• +due_date
• ...

Once the special character is typed in, a drop down with available items should occur to easy the process. 

This feature is well known from chats (Telegram, Watsapp) or other ToDo-Apps (Wunderlist).