feat: add pwa install button (#27)

* feat: add pwa tooltip

* feat: add pwa install button

src/stores/app.ts

@@ -0,0 +1,12 @@
+import { acceptHMRUpdate, defineStore } from 'pinia'
+
+export const useAppStore = defineStore('app', () => {
+  const deferredPrompt = ref<Event | any>()
+
+  return {
+    deferredPrompt,
+  }
+})
+
+if (import.meta.hot)
+  import.meta.hot.accept(acceptHMRUpdate(useAppStore, import.meta.hot))