Add resources for stack data structure

Dheeraj-06 · web-flow · commit c04aa2b695bd · 2025-12-29T11:59:37.000+05:30
Added resources for stack data structure.
diff --git a/Problems/Data-structures/Day-04/Resources.md b/Problems/Data-structures/Day-04/Resources.md
@@ -0,0 +1,4 @@
+[https://www.programiz.com/cpp-programming/stack]
+[https://www.youtube.com/watch?v=WK97Pj0wa7A&list=PL1w8k37X_6L9NXrP1D31hDTKcdAPIL0cG&index=10]
+
+Recommended for freshers.
