feat/sidebar-skeleton: added sidebar skeleton

components/MyPages/Sidebar/SidebarSkeleton.tsx

@@ -0,0 +1,13 @@
+import SkeletonShimmer from "@/components/SkeletonShimmer"
+
+import styles from "./sidebar.module.css"
+
+export default function SidebarSkeleton() {
+  return (
+    <aside className={styles.sidebar}>
+      <nav className={styles.nav}>
+        <SkeletonShimmer width={"100%"} height="500px" />
+      </nav>
+    </aside>
+  )
+}