Add containers project with CMake setup and array-related functionality

- Implement `printArrayAtPosition` in `functions.cpp` with input validation.
- Created `main.cpp` to demonstrate array operations using C arrays and `std::vector`.
- Updated `ClassA` and `IComparable` with constructors, destructors, and deep copy logic.
- Adjusted IntelliJ project configuration for new containers module.

cpp/classes/main.cpp

@@ -13,5 +13,18 @@ int main() {
 
     a.CompareTo(pA);
 
+    IComparable* pComparable = nullptr;
+    pComparable = new ClassA();
+    pComparable->CompareTo(&a);
+    // pA = dynamic_cast<ClassA *>(pComparable);
+    // if (pA != nullptr) {
+    //     pA->Print();
+    // }
+    delete pComparable;
+    pComparable = nullptr;
+
+    ClassA a2 = a;
+
+
     return 0;
 }