docs(link): rfc-002 (#164)

## Description
* Request for Change (RFC) for Possible Match with Log Odds Score
Threshold Range

## Related Issues
#139 

## Additional Notes
#18 

The language around the specific metric calculated from the distribution
of Log Odds Scores (e.g., median) is intentionally broad, in case the
Data Scientist on the DIBBs 4 Team would like to further experiment with
other metrics beyond median.

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Co-authored-by: Eric Buckley <[email protected]>