docs: add better grouping derivative examples #24
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Description
Provides better instructions on how to add your own grouping derivatives, including a plugin example that you can use directly if you like.
Fixes #20; fixes #21
Performance impact
None - docs.
Security impact
None - docs.
Checklist
yarn lint:fix
passes.I've added tests for the new feature, andyarn test
passes.I have detailed the new feature in the relevant documentation.I have added this feature to 'Pending' in theRELEASE_NOTES.md
file (if one exists).If this is a breaking change I've explained why.