added window to pane conversion to tmux.conf

tmux.conf

@@ -51,6 +51,7 @@ bind -r j resize-pane -D 2
 bind -r k resize-pane -U 2
 bind -r h resize-pane -L 2
 bind -r l resize-pane -R 2
+bind-key b command-prompt -p "create pane from:"  "join-pane -s ':%%'"
 
 # window title
 set-option -g set-titles on