Added String examples.

#include <iostream>

using namespace TNL

int main()

{

    String str("my world")

    int alloc_size = str.getAllocatedSize();

    cout << "alloc_size:" << alloc_size << endl;

}

 No newline at end of file

#include <iostream>

using namespace TNL

int main()

{

    String str("my world")

    int size = str.getSize();

    cout << "size of string:" << size << "bytes" << endl;

}

#include <iostream>

using namespace TNL

int main()

{

    int memory 

    memory.setSize( 256 );

    cout << "memory:" << memory << endl;

}