Add datasets for school district 'slices'

[graybeal]

What type of need does this dataset address?
A clear and concise description of the purpose of the dataset. Ex. Provide information that can be used to [...]
To perform analyses on specific aspects within a school district, e.g., data for particular school types (high school, middle, elementary), or school demographics.

If there is a specific dataset that meets this need, please specify it.
Describe the following dataset details as best you can.
Name:
IRI:
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License (URL where declared, or explanation of why you think it is publicly available):

Describe other options for this kind of data
If you don't have a specific data set in mind, provide a clear and concise description of any alternative datasets or sources you've considered.
User Mathew suggests there are data sets that target locations narrower than school districts, e.g., using school demographics. Q: Is it provided that way, or do we need to infer that info somehow? K-12 level has in-district segregation, district info is already aggregated. Examples are report codes on college acceptance, and more sophisticated placement data.

Additional context
Add any other context about the dataset request here. In particular, if you are an expert on this dataset, or can recommend someone who is, please make that clear.

[Dec 10 2020 PHS researcher feedback—Mathew]