Add doc2dial dataset
{'login': 'KMFODA', 'id': 35491698, 'node_id': 'MDQ6VXNlcjM1NDkxNjk4', 'avatar_url': 'https://avatars.githubusercontent.com/u/35491698?v=4', 'gravatar_id': '', 'url': 'https://api.github.com/users/KMFODA', 'html_url': 'https://github.com/KMFODA', 'followers_url': 'https://api.github.com/users/KMFODA/followers', 'following_url': 'https://api.github.com/users/KMFODA/following{/other_user}', 'gists_url': 'https://api.github.com/users/KMFODA/gists{/gist_id}', 'starred_url': 'https://api.github.com/users/KMFODA/starred{/owner}{/repo}', 'subscriptions_url': 'https://api.github.com/users/KMFODA/subscriptions', 'organizations_url': 'https://api.github.com/users/KMFODA/orgs', 'repos_url': 'https://api.github.com/users/KMFODA/repos', 'events_url': 'https://api.github.com/users/KMFODA/events{/privacy}', 'received_events_url': 'https://api.github.com/users/KMFODA/received_events', 'type': 'User', 'site_admin': False}
[]
[]
It not always practical to use nested `Sequence`. If you have troubles with sequence you can use lists instead. 

For example
```python

features=datasets.Features(
    {
        "dial_id": datasets.Value("string"),
        "doc_id": datasets.Value("string"),
        "domain": datasets.Value("string"),
        "turns": [
            {
                "turn_id": datasets.Value("int32"),
                "role": datasets.Value("string"),
                "da": datasets.Value("string"),
                "reference": [
                    {
                        "keys" : datasets.Value("string"),
                        "values": datasets.Value("string"),   
                    }

                ],
                "utterance": datasets.Value("string"),
            }
        ],
    }
),
```

this way `turns` will be a list of dict, and the "reference" key of `turns` will be a list of dict as well No problem thanks for all your help getting this to the final stages! Added .gitignore, removed .lock and applied the changes you asked for.
### Doc2dial: A Goal-Oriented Document-Grounded Dialogue Dataset v0.9

Once complete this will add the [Doc2dial](https://doc2dial.github.io/data.html) dataset from the generic data sets list.
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