chore: add resource under cpp:language-concepts:type-casting

src/data/roadmaps/cpp/content/109-language-concepts/101-type-casting/index.md

@@ -41,4 +41,6 @@ Type casting is the process of converting a value from one data type to another.
    *ptr = 20;  // Not recommended, use with caution
    ```
 
-Remember to use the right type of casting based on the specific situation and follow good programming practices in order to ensure a safe and efficient code.
+Remember to use the right type of casting based on the specific situation and follow good programming practices in order to ensure a safe and efficient code.
+
+- [Casting in C++](https://youtu.be/pWZS1MtxI-A)