feat(nvim): Add astronvim configuration

Signed-off-by: Noah Knegt <git@noahknegt.com>

.config/nvim/lua/polish.lua

@@ -0,0 +1,18 @@
+if true then return end -- WARN: REMOVE THIS LINE TO ACTIVATE THIS FILE
+
+-- This will run last in the setup process and is a good place to configure
+-- things like custom filetypes. This just pure lua so anything that doesn't
+-- fit in the normal config locations above can go here
+
+-- Set up custom filetypes
+vim.filetype.add {
+  extension = {
+    foo = "fooscript",
+  },
+  filename = {
+    ["Foofile"] = "fooscript",
+  },
+  pattern = {
+    ["~/%.config/foo/.*"] = "fooscript",
+  },
+}