Worked on ZString, MString and JString

JString.h

@@ -13,6 +13,20 @@ namespace coreutils {
    /// The [] operator is overriden from the ZString and provides a method to
    /// access the objects elements using a named path as the index to the items.
    ///
+   /// JString default constructor will create an empty JString object pointing
+   /// to an empty string.
+   ///
+   /// Use a constructor or assignment operator to initialize a JString to an
+   /// initial JSON string.
+   ///
+   /// Several constructors are available including a handle to a std::FILE
+   /// object to initialize the JSON string. On destruction the file is saved back.
+   ///
+   /// The [] operator can be used to access elements within the JSON string. 
+   /// Use:
+   ///       jstring["key"] = "value";
+   ///       std::cout << jstring["key"];
+   ///
 
    class JString : public MString {
 
@@ -34,7 +48,6 @@ namespace coreutils {
       void operator=(ZString &value);
       JString& operator=(const char *value);
 
-      // ZString operator[](const char *path);
       JString& operator[](const char *path);
       // operator const ZString () const {
       //    return *this;