chore(showcase): Add Nathaniel Ryan Mathew portfolio (#20499)

Added Personal Portfolio

Co-authored-by: Sidhartha Chatterjee <me@sidharthachatterjee.com>

docs/sites.yml

@@ -9230,6 +9230,19 @@
   built_by: Bare Advertising & Communications
   built_by_url: https://www.bare.ca/
   featured: false
+- title: Nathaniel Ryan Mathew
+  url: https://nathanielmathew.me
+  main_url: https://nathanielmathew.me
+  source_url: https://github.com/nathanielmathew/MyPortfolio
+  description: >
+    A personal online Portfolio built using GatsbyJS, that showcases Achievements, Projects and Additional information.
+  categories:
+    - Portfolio
+    - Open Source
+    - Blog
+  built_by: Nathaniel Ryan Mathew
+  built_by_url: https://github.com/nathanielmathew
+  featured: false
 - title: Kanazawa.js Community Page
   main_url: https://kanazawajs.now.sh/
   url: https://kanazawajs.now.sh/
@@ -9242,6 +9255,7 @@
     - Web Development
   built_by: Kanazawa.js
   built_by_url: https://twitter.com/knzw_js
+  featured: false
 - title: monica*dev
   url: https://www.aboutmonica.com/
   main_url: https://www.aboutmonica.com/
@@ -9254,6 +9268,7 @@
     - Portfolio
   built_by: Monica Powell
   built_by_url: https://www.aboutmonica.com/
+  featured: false
 - title: Shivam Sinha
   url: https://www.helloshivam.com/
   main_url: https://www.helloshivam.com/