Added testing function for ZString.

testing/zstring_test.cpp

@@ -0,0 +1,17 @@
+#include <iostream>
+#include "../ZString.h"
+
+int main(int argc, char **argv) {
+   
+   coreutils::ZString test("character1111:22222:33333");
+   test.length = 9;
+
+   test.split(":");
+   
+   std::cout << test << std::endl;
+   std::cout << test.getLength() << std::endl;
+
+   std::cout << test[0] << std::endl;
+   std::cout << test[1] << std::endl;   
+   
+}