Add instructions for setting filetype in Vim

site/content/blog/2019-04-15-setting-up-your-editor.md

@@ -10,4 +10,18 @@ draft: true
 
 * eslint-plugin-svelte3
 * svelte-vscode
-* associating .svelte files with HTML in VSCode, Sublime, Atom, etc etc etc
+* associating .svelte files with HTML in VSCode, Sublime, Atom, etc etc etc
+
+## Vim/Neovim
+
+To treat all `*.svelte` files as HTML, add the following line to your `init.vim`:
+
+    au! BufNewFile,BufRead *.svelte set ft=html
+
+To temporarily turn on HTML syntax highlighting for the current buffer, use:
+
+    :set ft=html
+
+To set the filetype for a single file, use a [modeline](https://vim.fandom.com/wiki/Modeline_magic):
+
+    <!-- vim: set ft=html :-->