message: Add sample code to README
  Add example of VOID for Credit Notes
diff: @@ -214,6 +214,23 @@ var invoiceId = "924XXXXXXXXXXX56f";
  })
  ```
  +
  +Void a Credit Note:
  +```javascript
  + var CreditNoteID = '7adXXXXXXXXXXXXXXXX2cda';
  +
  + var data = {
  + CreditNoteID: CreditNoteID,
  + Status: 'VOIDED'
  + };
  +
  + var creditnote = xeroClient.core.creditNotes.newCreditNote(data,null);
  + creditnote.save()
  + .then(function(ret) {
  + // Do something with the file
  + })
  +```
  +
  ## Docs
  Check the [`docs`](./docs) folder for more detailed examples of how to use each SDK function.
  