Add tmux config.

I've carried it around for years.

private_dot_config/tmux/tmux.conf

@@ -0,0 +1,18 @@
+bind-key h select-pane -L
+bind-key j select-pane -D
+bind-key k select-pane -U
+bind-key l select-pane -R
+
+# nested tmux, obey me
+bind-key a send-prefix
+
+# Avoid the annoying bit of delay when using the control character
+set -g escape-time 0
+set -g renumber-windows on
+
+# bind Ctrl-k to clearing history
+bind-key c clear-history
+
+# Show a visual bell, even on other windows
+set-window-option -g visual-bell both
+set-window-option -g bell-action other