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Create SPECIAL_INTEREST_GROUPS.md (#2686)

2nd attempt at this. Adding ".md" suffix. Intended to be a place for all our SIGs to better define who they are, how to join, expectations, etc.
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Neal Caidin committed
6ba1577240b79c9f613c2ea8d745c6ef6c832e50
Parent: 413b1a8
Committed by GitHub <noreply@github.com> on 10/7/2021, 4:19:25 PM