doc: add video demonstration hyperlink

Author: hozlucas28

.github/translations/es/README.md

@@ -31,7 +31,7 @@
 </p>
 
 <p align="center">
-    <strong><a href="#" target="_blank">(video demostrativo)</a></strong>
+    <strong><a href="https://youtu.be/o5M8t04p9Es?si=9KL47cKXzm7n2_Mw" target="_blank">(video demostrativo)</a></strong>
 </p>
 
 ## Resumen

README.md

@@ -31,7 +31,7 @@
 </p>
 
 <p align="center">
-    <strong><a href="#" target="_blank">(demonstration video)</a></strong>
+    <strong><a href="https://youtu.be/o5M8t04p9Es?si=9KL47cKXzm7n2_Mw" target="_blank">(demonstration video)</a></strong>
 </p>
 
 ## Summary