Add tutorial for no-code dataset upload
MEMBER
Cool, love it ! :)

Feel free to add a paragraph saying how to load the dataset:
```python
from datasets import load_dataset

dataset = load_dataset("stevhliu/demo")

# or to separate each csv file into several splits
data_files = {"train": "train.csv", "test": "test.csv"}
dataset = load_dataset("stevhliu/demo", data_files=data_files)
print(dataset["train"][0])
```
2021-09-17T15:33:01Z
https://github.com/huggingface/datasets/pull/2925#issuecomment-921890372
https://api.github.com/repos/huggingface/datasets/issues/2925
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2021-09-17T15:33:01Z
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MEMBER
Perfect, feel free to mark this PR ready for review :)

cc @albertvillanova do you have any comment ? You can check the tutorial here:
https://47389-250213286-gh.circle-artifacts.com/0/docs/_build/html/no_code_upload.html

Maybe we can just add a list of supported file types:
- csv
- json
- json lines
- text
- parquet
2021-09-21T15:37:56Z
https://github.com/huggingface/datasets/pull/2925#issuecomment-924109045
https://api.github.com/repos/huggingface/datasets/issues/2925
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2021-09-21T15:37:56Z
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MEMBER
I just added a mention of the login for private datasets. Don't hesitate to edit or comment.

Otherwise I think it's all good, feel free to merge it @stevhliu  if you don't have other changes to make :)
2021-09-23T13:29:20Z
https://github.com/huggingface/datasets/pull/2925#issuecomment-925817789
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2021-09-23T13:29:20Z
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This PR is for a tutorial for uploading a dataset to the Hub. It relies on the Hub UI elements to upload a dataset, introduces the online tagging tool for creating tags, and the Dataset card template to get a head start on filling it out. The addition of this tutorial should make it easier for beginners to upload a dataset without accessing the terminal or knowing Git.