chore: add resource link to cpp >> introduction:what-is-cpp

src/data/roadmaps/cpp/content/100-introduction/100-what-is-cpp.md

@@ -1,4 +1,5 @@
 #  What is C++?
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 C++ is a general-purpose programming language created by Bjarne Stroustrup as an extension of the C programming language. It was first introduced in 1985 and provides object-oriented features like classes and inheritance. C++ is widely used in various applications like game development, system programming, embedded systems, and high-performance computing.
 
 C++ is a statically-typed language, meaning that the type of a variable is determined during compilation, and has an extensive library called the C++ Standard Library, which provides a rich set of functions, algorithms, and data structures for various tasks.
@@ -43,3 +44,5 @@ int main() {
 ```
 
 In the above program, we define a simple function `add` and a class `Calculator` with a member function `multiply`. The `main` function demonstrates how to use these to perform basic arithmetic.
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+- [C++ Tutorial for Beginners - Full Course](https://youtu.be/vlnpwxzdw4y)