add old files

nvim/lua/plugins/vimtex.lua

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+return{
+    'lervag/vimtex',
+    config = function()
+        -- This is necessary for VimTeX to load properly. The "indent" is optional.
+        -- Note that most plugin managers will do this automatically.
+        vim.cmd("filetype plugin indent on")
+
+        -- This enables Vim's and neovim's syntax-related features. Without this, some
+        -- VimTeX features will not work (see ":help vimtex-requirements" for more
+        --info).
+        vim.cmd("syntax enable")
+
+        -- Viewer options: One may configure the viewer either by specifying a built-in
+        -- viewer method:
+        vim.cmd("let g:vimtex_view_method = 'zathura'")
+
+    end,
+}