code: public void add(Value value) {
  		Key subKey = makeSubKey(value);
  
  		client.put(this.policy, subKey, new Bin(ListElementBinName, value));
  
  		// add the digest of the subKey to the CDT List in the Customer record
  		client.operate(this.policy, this.key, ListOperation.append(this.binNameString, Value.get(subKey.digest)));
  	}
docs: Add value to list. Fail if value's key exists and list is configured for unique keys.
  If value is a map, the key is identified by "key" entry.  Otherwise, the value is the key.
  If large list does not exist, create it.
  <p>
  
  @param value value to add