feat(seo): Implement sitemap

- Added `sitemap.xml` for better search engine indexing.
- Included URLs for homepage, about, events, projects, and contact pages.
- Set appropriate change frequencies and priorities.

public/sitemap.xml

@@ -0,0 +1,42 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
+  <!-- Homepage -->
+  <url>
+    <loc>https://clders.com/</loc>
+    <lastmod>2024-11-29</lastmod>
+    <changefreq>monthly</changefreq>
+    <priority>1.0</priority>
+  </url>
+
+  <!-- About Page -->
+  <url>
+    <loc>https://clders.com/about</loc>
+    <lastmod>2024-11-29</lastmod>
+    <changefreq>monthly</changefreq>
+    <priority>0.8</priority>
+  </url>
+
+  <!-- Events Page -->
+  <url>
+    <loc>https://clders.com/events</loc>
+    <lastmod>2024-11-29</lastmod>
+    <changefreq>weekly</changefreq>
+    <priority>0.8</priority>
+  </url>
+
+  <!-- Projects Page -->
+  <url>
+    <loc>https://clders.com/projects</loc>
+    <lastmod>2024-11-29</lastmod>
+    <changefreq>monthly</changefreq>
+    <priority>0.8</priority>
+  </url>
+
+  <!-- Contact Page -->
+  <url>
+    <loc>https://clders.com/contact</loc>
+    <lastmod>2024-11-29</lastmod>
+    <changefreq>monthly</changefreq>
+    <priority>0.8</priority>
+  </url>
+</urlset>