Add SciTLDR Dataset
CONTRIBUTOR
CI failures seem to be unrelated (related to `norwegian_ner`)
```
FAILED tests/test_dataset_common.py::RemoteDatasetTest::test_builder_class_norwegian_ner
FAILED tests/test_dataset_common.py::RemoteDatasetTest::test_builder_configs_norwegian_ner
FAILED tests/test_dataset_common.py::RemoteDatasetTest::test_load_dataset_norwegian_ner
```
2020-12-02T09:15:10Z
https://github.com/huggingface/datasets/pull/986#issuecomment-737099303
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2020-12-02T09:52:52Z
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MEMBER
you can just rebase from master to fix the CI :) 
2020-12-02T15:59:48Z
https://github.com/huggingface/datasets/pull/986#issuecomment-737323672
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MEMBER
can you just rebase from master before we merge ?
2020-12-02T16:10:38Z
https://github.com/huggingface/datasets/pull/986#issuecomment-737331238
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2020-12-02T16:10:38Z
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CONTRIBUTOR
Sorry, the rebase from master went horribly wrong, I guess I'll just open another PR

Closing this one due to a mistake in rebasing :(
2020-12-02T18:02:59Z
https://github.com/huggingface/datasets/pull/986#issuecomment-737399052
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CONTRIBUTOR
Continued in #1014 
2020-12-02T18:24:40Z
https://github.com/huggingface/datasets/pull/986#issuecomment-737410733
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Adds the SciTLDR Dataset by AI2
Added README card with tags to the best of my knowledge

Multi-target summaries or TLDRs of Scientific Documents