added user roles, login screen, readme file and some visual changes
Revert "added user roles, login screen, readme file and some visual changes"

This reverts commit 75366b0df370ecd2af87a78434b7b4b1cc3aae8b.
added user roles, login screen, readme file and some visual changes
fixed editing user roles and ban users method
changed readme
Merge pull request #98 from dinev7/master

1301681052-DanailDinev (second task)