add Vk MessageType enum
add message read state enum
add message send state enum
add attachment type enum
add attachment abstract class enum
Revert "add attachment type enum"

This reverts commit 3948934c75a085d723a8ce6d61b0aa70fbd0f326.
create simple documentation
add atachment type enum
add all attachment class
complete photo attachment
change accesibility level
create documentation