adding example for wrapping pre-created objects about node-addon-examples

[rvagg]

generally the way you have to approach this is write completely new wrappers for the classes with explicit accessors, I don't believe there's a generic way to just wrap an object other than writing the whole wrapper yourself. I probably wouldn't bother subclassing either because your exposed methods need their own signatures for V8 so just keep a private instance of the class you're wrapping and write accessors for it.

Check out https://github.com/justmoon/node-bignum/blob/master/bignum.cc for some intensive wrapping of existing methods on existing classes.

[Trott]

Should this issue remain open? Moreover, is this repository something that should be archived?