Write / Update Open311 API documentation page

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Is your feature request related to a problem? Please describe.

https://popravi.to/open311

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Additional context

See examples: https://fixmystreet.com/open311 and https://web.archive.org/web/20211105182144/http://fixmystreet.org.nz/api

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FMS Open311 API explained:

• https://www.mysociety.org/2013/01/17/open311-explained/
• https://www.mysociety.org/2013/02/20/open311-extended/
• https://www.societyworks.org/case-studies/city-of-westminster/
• https://www.societyworks.org/case-studies/oxfordshire/

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[FixMyStreet] Open311 integration documentation RFC https://groups.google.com/a/mysociety.org/g/fixmystreet/c/WUCe63mjjB0/m/gLqQyOu8WG8J

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