Add tags for task_ids:summarization-* and task_categories:summarization*
{'login': 'hobson', 'id': 292855, 'node_id': 'MDQ6VXNlcjI5Mjg1NQ==', 'avatar_url': 'https://avatars.githubusercontent.com/u/292855?v=4', 'gravatar_id': '', 'url': 'https://api.github.com/users/hobson', 'html_url': 'https://github.com/hobson', 'followers_url': 'https://api.github.com/users/hobson/followers', 'following_url': 'https://api.github.com/users/hobson/following{/other_user}', 'gists_url': 'https://api.github.com/users/hobson/gists{/gist_id}', 'starred_url': 'https://api.github.com/users/hobson/starred{/owner}{/repo}', 'subscriptions_url': 'https://api.github.com/users/hobson/subscriptions', 'organizations_url': 'https://api.github.com/users/hobson/orgs', 'repos_url': 'https://api.github.com/users/hobson/repos', 'events_url': 'https://api.github.com/users/hobson/events{/privacy}', 'received_events_url': 'https://api.github.com/users/hobson/received_events', 'type': 'User', 'site_admin': False}
[]
[]
Associated community discussion is [here](https://huggingface.co/datasets/aeslc/discussions/1).
Paper referenced in the `dataset_infos.json` is [here](https://arxiv.org/pdf/1906.03497.pdf). It mentions the  _email-subject-generation_ task, which is not a tag mentioned in any other dataset so it was not added in this pull request. The _summarization_ task is mentioned as a related task. _The documentation is not available anymore as the PR was closed or merged._
yaml header at top of README.md file was edited to add task tags because I couldn't find the existing tags in the json
separate Pull Request will modify dataset_infos.json to add these tags

The Enron dataset (dataset id aeslc) is only tagged with:

    arxiv:1906.03497'
    languages:en
    pretty_name:AESLC

Using the email subject_line field as a label or target variable it possible to create models for the following task_ids (in order of relevance):

    'task_ids:summarization'
    'task_ids:summarization-other-conversations-summarization'
    "task_ids:other-other-query-based-multi-document-summarization"
    'task_ids:summarization-other-aspect-based-summarization'
    'task_ids:summarization--other-headline-generation'

The subject might also be used for the task_category "task_categories:summarization"

E-mail chains might be used for the task category "task_categories:dialogue-system"
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