init: basic structure

src/pages/README.md

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+## File-based Routing
+
+Routes will be auto-generated for Vue files in this dir with the same file structure.
+Check out [`vite-plugin-pages`](https://github.com/hannoeru/vite-plugin-pages) for more details.
+
+### Path Aliasing
+
+`~/` is aliased to `./src/` folder.
+
+For example, instead of having
+
+```ts
+import { isDark } from '../../../../composables'
+```
+
+now, you can use
+
+```ts
+import { isDark } from '~/composables'
+```