set filetype to tex for lco files

lua/lennartalff/init.lua

@@ -2,3 +2,16 @@ require('lennartalff.remap')
 require('lennartalff.set')
 vim.o.termguicolors = true
 vim.cmd.colorscheme 'catppuccin-frappe'
+
+local filetypeGroup = vim.api.nvim_create_augroup('filetype', { clear = true })
+
+vim.api.nvim_create_autocmd(
+    { 'BufRead', 'BufNewFile' },
+    {
+        pattern = { '*.lco' },
+        callback = function()
+            vim.bo.filetype = 'tex'
+        end,
+        group = filetypeGroup
+    }
+)