Start implementing a new user page for account and security settings

Frontend/src/pages/user/Loading.svelte

@@ -0,0 +1,19 @@
+<script lang="ts">
+  import { Alert, Spinner } from "flowbite-svelte";
+
+  export let loading: boolean;
+  export let error: string | undefined;
+</script>
+
+{#if loading}
+  <div class="h-full flex justify-center items-center">
+    <Spinner size={"16"} />
+  </div>
+{:else if error}
+  <Alert color="red">
+    <span class="font-medium">Error occured!</span>
+    {error}
+  </Alert>
+{:else}
+  <slot />
+{/if}