added photo generator and tip calculator app

Author: sumn2u

en/beginner-projects/random-photos-generator.md

@@ -20,4 +20,12 @@ Create a fun app that displays random photos from a collection each time you cli
 ## Bonus Challenge
 Fetch random photos from an external API like Unsplash.
 
-
+## Live Demo
+<div align="center">
+<iframe src="https://codesandbox.io/embed/lpg2t5?view=preview&module=%2Fapp.js"
+     style="width:100%; height: 500px; border:0; border-radius: 4px; overflow:hidden;"
+     title="random-photo-viewer"
+     allow="accelerometer; ambient-light-sensor; camera; encrypted-media; geolocation; gyroscope; hid; microphone; midi; payment; usb; vr; xr-spatial-tracking"
+     sandbox="allow-forms allow-modals allow-popups allow-presentation allow-same-origin allow-scripts"
+></iframe>
+</div>

en/beginner-projects/tip-calculator.md

@@ -19,4 +19,12 @@ Create a project where users can calculate tips based on a given bill amount and
 ## Bonus Challenge
 Add a “Split Bill” feature to divide the total between multiple people.
 
-
+## Live Demo
+<div align="center">
+<iframe src="https://codesandbox.io/embed/4fxhyc?view=preview&module=%2Findex.html"
+     style="width:100%; height: 500px; border:0; border-radius: 4px; overflow:hidden;"
+     title="tip-calculator"
+     allow="accelerometer; ambient-light-sensor; camera; encrypted-media; geolocation; gyroscope; hid; microphone; midi; payment; usb; vr; xr-spatial-tracking"
+     sandbox="allow-forms allow-modals allow-popups allow-presentation allow-same-origin allow-scripts"
+></iframe>
+</div>