set title and titlestring

lua/my_options.lua

@@ -41,6 +41,8 @@ opt.spelllang= 'en,de'
 opt.completeopt= 'menu,menuone,noselect'
 opt.expandtab= true
 opt.smartindent= true
+opt.title = true
+opt.titlestring = '%{getcwd()} - %t'
 
 -- go to previous/next line with h,l,left arrow and right arrow
 -- when cursor reaches end/beginning of line