write doc for Esri repo maintainers regarding topics

Esri / esri.github.io

Esri GitHub landing page

http://esri.github.io/

Apache License 2.0

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Closed jgravois closed 7 years ago

jgravois commented 7 years ago

point to GitHub doc on adding/editing topics
link to our own .yaml file with established conventions
highlight our 5 overarching thematic topics and recommend that repo owners use them if they're relevant