Add tmux config

tmux/.tmux.conf

+bind j select-pane -D
+bind k select-pane -U
+bind h select-pane -L
+bind l select-pane -R
+
+bind v split-window -h
+bind s split-window -v
+
+bind -r J resize-pane -D 5
+bind -r K resize-pane -U 5
+bind -r H resize-pane -L 5
+bind -r L resize-pane -R 5
+
+set -g pane-border-fg white
+set -g pane-active-border-fg cyan
+set -g pane-active-border-bg cyan