Adding first draft of the API data standards

[rmbielby]

Overview of changes

I've added a page summarising (and signposting) standards that will be a requirement (above and beyond the base EES standards) for data sets being uploaded for use with the API.

Why are these changes being made?

We want a much more coherent data ecosystem when it comes to the API and we'll be manually checking data files against this. So we need a framework laying out clearly both for analysts intending to make data their data available via the API, and for us when reviewing a data set for acceptance on to the system.

Detailed description of changes

I've added a specific API data standards page which is linked from the statistics production menu.

This covers four key elements:

• tidy data
• standardised filter names and items
• standardised indicator names
• character constraints on column names, labels and filter items

Issue ticket number/s and link

Checklist before requesting a review

• I have checked the contributing guidelines
• I have checked for and linked any relevant issues that this may resolve
• I have checked that these changes build locally
• I understand that if merged into main, these changes will be publicly available

[cjrace]

Looks good, left some initial comments and now wondering about how we can start building up a reference table of all indicators, filters and filter options under them as new data sets come into the API

[rmbielby]

Analysts Guide: add a section on data standards for publishing via a public API

[cjrace]

Few minor things left (including one older comment above I think you've missed?)