Add containers module with initial implementation and integrate into CMake build system.

cpp/classes/main.cpp

@@ -1,4 +1,5 @@
 #include "ClassA.h"
+#include <list>
 
 int main() {
     ClassA a{};
@@ -20,5 +21,24 @@ int main() {
     delete pComparable;
     pComparable = nullptr;
 
+    // copy object
+    ClassA a2 = a;
+
+    std::list<ClassA> list;
+    std::list<ClassA>::iterator it;
+
+    for (it = list.begin(); it != list.end(); ++it) {
+       it->Print();
+    }
+
+    std::list<IComparable*> list2;
+    std::list<IComparable*>::iterator it2;
+
+    for (it2 = list2.begin(); it2 != list2.end(); ++it2) {
+        (*it2)->CompareTo(&a);
+    }
+
+    IComparable* pComparables[10];
+
     return 0;
 }