Add tmux multiplexer (#1472)

Tmux documentation

content/roadmaps/102-devops/content/102-managing-servers/101-live-in-terminal/101-tmux-multiplexer.md

@@ -1 +1,10 @@
-# Tmux multiplexer
+# Tmux
+
+Tmux is a terminal multiplexer: it enables a number of terminals to be created, accessed, and controlled from a single screen. Tmux may be detached from a screen and continue running in the background, then later reattached.
+
+When tmux is started it creates a new session with a single window and displays it on screen. A status line at the bottom of the screen shows information on the current session and is used to enter interactive commands.
+
+See `man tmux` further information
+
+<BadgeLink badgeText='Cheat Sheet' colorScheme='blue' href='https://tmuxcheatsheet.com/'>Tux Cheat Sheet</BadgeLink>
+<BadgeLink badgeText='Documentation' colorScheme='blue' href='https://tmuxguide.readthedocs.io/en/latest/tmux/tmux.html'>Tmux Documentation</BadgeLink>