feat: support layouts (#56)

Co-authored-by: Anthony Fu <anthonyfu117@hotmail.com>

src/layouts/README.md

@@ -0,0 +1,14 @@
+## Layouts
+
+Vue components in this dir are used as layouts.
+
+By default, `default.vue` will be used unless an alternative is specified in the route meta.
+
+With [`vite-plugin-pages`](https://github.com/hannoeru/vite-plugin-pages) and [`vite-plugin-vue-layouts`](https://github.com/JohnCampionJr/vite-plugin-vue-layouts), you can specify the layout in the page's SFCs like this:
+
+```html
+<route lang="yaml">
+meta:
+  layout: home
+</route>
+```