added tmux code

.zshrc

@@ -112,3 +112,14 @@ eval $(thefuck --alias)
 eval $(thefuck --alias fk)
 
 zinit light Aloxaf/fzf-tab
+
+if [[ -z "$TMUX" ]]; then
+    tmux has-session &> /dev/null
+    if [ $? -eq 1 ]; then
+      exec tmux new -s ssh_session
+      exit
+    else
+      exec tmux attach -t ssh_session
+      exit
+    fi
+fi