feat: add demo images and video to README for enhanced project presentation

Author: Alejandro Caicedo

README.md

@@ -26,7 +26,18 @@ Perfect for:
 
 ## 🎥 Demo
 
-> Screenshots / GIFs coming soon
+<p align="center">
+  <!-- Fila de imágenes -->
+  <img src="./assets/rnkit_preview_android.png" width="45%" />
+  <img src="./assets/rnkit_preview_ios.png" width="45%" />
+</p>
+
+<p align="center">
+  <!-- "Video" (thumbnail clickeable) -->
+  <a href="./assets/rnkit_review.mp4">
+    <video src="./assets/rnkit_review.mp4" controls width="92%"></video>
+  </a>
+</p>
 
 ## ✨ Features
 

assets/rnkit_preview_android.png

@@ -4770,6 +4770,6 @@ SPEC CHECKSUMS:
   SocketRocket: d4aabe649be1e368d1318fdf28a022d714d65748
   Yoga: c7fcecd3a5864321db161a74cf2cd735f800c119
 
-PODFILE CHECKSUM: 8ab6f4c097a590ad39897e43f96e05df8702e99d
+PODFILE CHECKSUM: 4950fcbe98efdcb29b0fb8c29188803f6ccab490
 
 COCOAPODS: 1.15.2