Create a resource in the remote Transifex server.

def _create(self, **kwargs):
        """Create a resource in the remote Transifex server."""
        path = self._construct_path_to_collection()

        # Use the fields for which we have values
        for field in self.writable_fields:
            try:
                value = getattr(self, field)
                kwargs[field] = value
            except AttributeError:
                pass
        return self._http.post(path, json.dumps(kwargs))