on defining metrics

[alainchau]

Added short example on how to write metrics.

[codecov-io]

Codecov Report

Merging #94 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #94   +/-   ##
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  Coverage   93.05%   93.05%           
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  Files          14       14           
  Lines         475      475           
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  Hits          442      442           
  Misses         33       33

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[dkarrasch]

This seems to close #65.

[scepeda78]

I didnt get well how to add other metric..., for example the haversine metric is quite useful for comparing geographic distances...

https://github.com/JuliaStats/Distances.jl/blob/master/src/haversine.jl

Sorry if that is a newby question... :(