A directory-category for terminal emulators

[AndersonTorres]

I have made a pull request for Nixpkgs, creating a directory for terminal emulators.

Terminal emulators are an ubiquitous tool for any Unix user; even the beginners
are routinely familiarized to it. And, manifestly, there are many
implementations of terminal emulators out there, from those traditionally made
in C and C++ to those written in Haskell and Go.

Here is it:

Create a directory-category for terminal emulators