<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def add(self, cls_or_branch, *args, **kwargs):
 """Adds a task or branch to the lane. Parameters cls_or_branch : Class *args Variable length argument list to be passed to `cls_or_branch` during instantiation **kwargs Variable length keyword arguments to be passed to `cls_or_branch` during instantiation Returns ------- self: Returns `self` to allow method chaining """

        if isinstance(cls_or_branch, Branch):
            self.tasks.append(cls_or_branch)  # Add branch with already validated tasks
        else:
            # Validate
            self.__validate_task(cls_or_branch, '__init__', args, kwargs)
            # Append
            self.tasks.append({'cls_or_branch': cls_or_branch, 'args': args, 'kwargs': kwargs})

        return self