tmux added to zsh additions

zshrc.d/__available__/tmux.zsh

@@ -0,0 +1,4 @@
+if command -v tmux &> /dev/null && [ -n "$PS1" ] && [[ ! "$TERM" =~ screen ]] && [[ ! "$TERM" =~ tmux ]] && [ -z "$TMUX" ]; then
+  exec tmux_default
+fi
+