visualize : implement terminal

[gabru-md]

create a terminal on the left hand side of the page. Switch to visualize branch in this repository to work on this feature.
check the angular frontend, git-visualize and search for the terminal.component and make a terminal.

The terminal.component must be made to comply with the theme of the linux terminal.

Further bugs and features will be created as issues and can be worked upon later.

Cheers!

[gabru-md]

we have shifted to react, can we have someone who can work on this issue now please ?