feat: add tui topic page and logo

topics/tui/index.md

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+---
+aliases: text-based-user-interface, terminal-user-interface
+display_name: Text-based user interface
+related: cli, terminal
+short_description: Text-based user interfaces use text displays for interactive computing in terminal environments.
+topic: tui
+logo: tui.png
+wikipedia_url: https://en.wikipedia.org/wiki/Text-based_user_interface
+---
+In computing, text-based user interfaces (TUI) (alternately terminal user interfaces, to reflect a dependence upon the properties of computer terminals and not just text), is a retronym describing a type of user interface (UI) common as an early form of human–computer interaction, before the advent of bitmapped displays and modern conventional graphical user interfaces (GUIs). Like modern GUIs, they can use the entire screen area and may accept mouse and other inputs. They may also use color and often structure the display using box-drawing characters such as ┌ and ╣. The modern context of use is usually a terminal emulator.