add tmux cheatsheet

tmux-cheatsheet.md

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+# Tmux Cheatsheet
+
+## Basics
+- Start new session: `tmux` or `tmux new -s session_name`
+- Attach to session: `tmux attach -t session_name`
+- List sessions: `tmux ls`
+- Detach from session: Prefix + d
+
+## Prefix Key
+- Default: Ctrl-b (C-b)
+
+## Windows (Tabs)
+- Create window: Prefix + c
+- Next window: Prefix + n
+- Previous window: Prefix + p
+- Rename window: Prefix + ,
+- Kill window: Prefix + &
+
+## Panes (Splits)
+- Split horizontally: Prefix + %
+- Split vertically: Prefix + "
+- Navigate panes: Prefix + arrow keys
+- Resize pane: Prefix + hold arrow
+- Kill pane: Prefix + x
+- Zoom pane: Prefix + z
+
+## Copy Mode
+- Enter copy mode: Prefix + [
+- Exit: q
+- Copy: Space to start, Enter to copy
+
+## Other
+- Reload config: Prefix + r (after binding in .tmux.conf)
+- Kill session: `tmux kill-session -t session_name`
+
+Customize with ~/.tmux.conf