add tmux to graduated software

software/graduated/tmux/tmux.md

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+# Tmux
+
+## Commands I keep losing
+
+```bash
+# attach if exists, create if not
+tmux new-session -A -s name
+
+# list sessions
+tmux ls
+
+# switch to another session from within a session
+tmux switch-client -t name
+
+# kill a session
+tmux kill-session -t name
+```
+
+## Example conf
+
+Config is located at `$HOME/.tmux.conf`
+
+```bash
+# Set teh default shell
+set-option -g default-shell "/bin/zsh"
+
+# Split panes using | and _
+bind | split-window -h
+bind _ split-window -v
+# Remove the split panes % and " bindings
+unbind '"'
+unbind %
+
+# Set mouse mode (for scrolling)
+set -g mouse on
+
+# Press ctrl + r to reload tmux when you update this config
+bind r source-file ~/.tmux.conf \; display ​"Reloaded!"
+```