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/IComparable.h

@@ -1,8 +1,13 @@
 #ifndef CLASSES_ICOMPARABLE_H
 #define CLASSES_ICOMPARABLE_H
+#include <iostream>
 
 class IComparable {
 public:
+    // only for presentation purpose
+    IComparable() { std::cout << "IComparable created" << std::endl; }
+    virtual ~IComparable() { std::cout << "IComparable destroyed" << std::endl; }
+
     virtual int CompareTo(IComparable* other) = 0;
 };