WIP: Add summary statistics to the dataresource
- [ ] closes 
- [ ] tests added / passed
- [ ] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [ ] whatsnew entry

Following the discussion in https://github.com/nteract/nteract/issues/3177, this adds summary statistics for folks using the dataresource. Our main concern is how this might affect performance.

I wouldn't have put this up before the tests are passing, but as @rgbkrk and I are currently attending a Numfocus event, we hoped we might catch up with @jreback and/or others in person if anyone is attending to discuss and wanted to get the ball rolling 🙂. 

cc @TomAugspurger 
Hello @alexandercbooth! Thanks for submitting the PR.

 - There are no PEP8 issues in the file [`pandas/io/json/table_schema.py`](https://github.com/alexandercbooth/pandas/blob/6015f9946e80ea772a7e1868c8276d302e2a25ab/pandas/io/json/table_schema.py) !

 - In the file [`pandas/tests/io/json/test_json_table_schema.py`](https://github.com/alexandercbooth/pandas/blob/6015f9946e80ea772a7e1868c8276d302e2a25ab/pandas/tests/io/json/test_json_table_schema.py), following                are the PEP8 issues :
> [Line 35:9](https://github.com/alexandercbooth/pandas/blob/6015f9946e80ea772a7e1868c8276d302e2a25ab/pandas/tests/io/json/test_json_table_schema.py#L35): [E128](https://duckduckgo.com/?q=pep8%20E128) continuation line under-indented for visual indent
> [Line 36:9](https://github.com/alexandercbooth/pandas/blob/6015f9946e80ea772a7e1868c8276d302e2a25ab/pandas/tests/io/json/test_json_table_schema.py#L36): [E128](https://duckduckgo.com/?q=pep8%20E128) continuation line under-indented for visual indent
> [Line 37:13](https://github.com/alexandercbooth/pandas/blob/6015f9946e80ea772a7e1868c8276d302e2a25ab/pandas/tests/io/json/test_json_table_schema.py#L37): [E128](https://duckduckgo.com/?q=pep8%20E128) continuation line under-indented for visual indent
> [Line 38:13](https://github.com/alexandercbooth/pandas/blob/6015f9946e80ea772a7e1868c8276d302e2a25ab/pandas/tests/io/json/test_json_table_schema.py#L38): [E128](https://duckduckgo.com/?q=pep8%20E128) continuation line under-indented for visual indent
> [Line 39:13](https://github.com/alexandercbooth/pandas/blob/6015f9946e80ea772a7e1868c8276d302e2a25ab/pandas/tests/io/json/test_json_table_schema.py#L39): [E128](https://duckduckgo.com/?q=pep8%20E128) continuation line under-indented for visual indent
> [Line 40:13](https://github.com/alexandercbooth/pandas/blob/6015f9946e80ea772a7e1868c8276d302e2a25ab/pandas/tests/io/json/test_json_table_schema.py#L40): [E128](https://duckduckgo.com/?q=pep8%20E128) continuation line under-indented for visual indent
> [Line 41:13](https://github.com/alexandercbooth/pandas/blob/6015f9946e80ea772a7e1868c8276d302e2a25ab/pandas/tests/io/json/test_json_table_schema.py#L41): [E128](https://duckduckgo.com/?q=pep8%20E128) continuation line under-indented for visual indent
> [Line 42:13](https://github.com/alexandercbooth/pandas/blob/6015f9946e80ea772a7e1868c8276d302e2a25ab/pandas/tests/io/json/test_json_table_schema.py#L42): [E128](https://duckduckgo.com/?q=pep8%20E128) continuation line under-indented for visual indent
> [Line 43:13](https://github.com/alexandercbooth/pandas/blob/6015f9946e80ea772a7e1868c8276d302e2a25ab/pandas/tests/io/json/test_json_table_schema.py#L43): [E128](https://duckduckgo.com/?q=pep8%20E128) continuation line under-indented for visual indent
> [Line 45:9](https://github.com/alexandercbooth/pandas/blob/6015f9946e80ea772a7e1868c8276d302e2a25ab/pandas/tests/io/json/test_json_table_schema.py#L45): [E122](https://duckduckgo.com/?q=pep8%20E122) continuation line missing indentation or outdented
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> [Line 47:9](https://github.com/alexandercbooth/pandas/blob/6015f9946e80ea772a7e1868c8276d302e2a25ab/pandas/tests/io/json/test_json_table_schema.py#L47): [E128](https://duckduckgo.com/?q=pep8%20E128) continuation line under-indented for visual indent
> [Line 48:9](https://github.com/alexandercbooth/pandas/blob/6015f9946e80ea772a7e1868c8276d302e2a25ab/pandas/tests/io/json/test_json_table_schema.py#L48): [E122](https://duckduckgo.com/?q=pep8%20E122) continuation line missing indentation or outdented
> [Line 49:9](https://github.com/alexandercbooth/pandas/blob/6015f9946e80ea772a7e1868c8276d302e2a25ab/pandas/tests/io/json/test_json_table_schema.py#L49): [E128](https://duckduckgo.com/?q=pep8%20E128) continuation line under-indented for visual indent
> [Line 50:13](https://github.com/alexandercbooth/pandas/blob/6015f9946e80ea772a7e1868c8276d302e2a25ab/pandas/tests/io/json/test_json_table_schema.py#L50): [E128](https://duckduckgo.com/?q=pep8%20E128) continuation line under-indented for visual indent
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> [Line 53:13](https://github.com/alexandercbooth/pandas/blob/6015f9946e80ea772a7e1868c8276d302e2a25ab/pandas/tests/io/json/test_json_table_schema.py#L53): [E128](https://duckduckgo.com/?q=pep8%20E128) continuation line under-indented for visual indent
> [Line 54:13](https://github.com/alexandercbooth/pandas/blob/6015f9946e80ea772a7e1868c8276d302e2a25ab/pandas/tests/io/json/test_json_table_schema.py#L54): [E128](https://duckduckgo.com/?q=pep8%20E128) continuation line under-indented for visual indent
> [Line 56:9](https://github.com/alexandercbooth/pandas/blob/6015f9946e80ea772a7e1868c8276d302e2a25ab/pandas/tests/io/json/test_json_table_schema.py#L56): [E122](https://duckduckgo.com/?q=pep8%20E122) continuation line missing indentation or outdented
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> [Line 62:13](https://github.com/alexandercbooth/pandas/blob/6015f9946e80ea772a7e1868c8276d302e2a25ab/pandas/tests/io/json/test_json_table_schema.py#L62): [E128](https://duckduckgo.com/?q=pep8%20E128) continuation line under-indented for visual indent
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> [Line 473:21](https://github.com/alexandercbooth/pandas/blob/6015f9946e80ea772a7e1868c8276d302e2a25ab/pandas/tests/io/json/test_json_table_schema.py#L473): [E128](https://duckduckgo.com/?q=pep8%20E128) continuation line under-indented for visual indent
> [Line 474:21](https://github.com/alexandercbooth/pandas/blob/6015f9946e80ea772a7e1868c8276d302e2a25ab/pandas/tests/io/json/test_json_table_schema.py#L474): [E128](https://duckduckgo.com/?q=pep8%20E128) continuation line under-indented for visual indent
> [Line 475:21](https://github.com/alexandercbooth/pandas/blob/6015f9946e80ea772a7e1868c8276d302e2a25ab/pandas/tests/io/json/test_json_table_schema.py#L475): [E128](https://duckduckgo.com/?q=pep8%20E128) continuation line under-indented for visual indent
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> [Line 494:21](https://github.com/alexandercbooth/pandas/blob/6015f9946e80ea772a7e1868c8276d302e2a25ab/pandas/tests/io/json/test_json_table_schema.py#L494): [E128](https://duckduckgo.com/?q=pep8%20E128) continuation line under-indented for visual indent
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 With this PR, it relies on the specific output of pandas' `describe` method, but shouldn't this be some standardized fields in the table schema spec?  @rufuspollock @pwalsh -- is there a standardized section for summary statistics (similar to what `df.describe()` does) for the data or could we add it to the spec for data resource? closing as stale. if you'd like to continue, pls ping.