Hi Saman,

Right now You can:

1. add Module login (core) using Module addon or
2. install extra login module from JED then use it like in 1) or
3. add Button addon (with link) that redirect users to the login page (Menu item > User > Login component view).

Also, we don't have Login addon, and so far we don't plan it. And task 1 or 3 you can finish in 90sec.