Added todo to readme, and documentation for quality function

src/lib.rs

@@ -256,6 +256,7 @@ pub(crate) fn evidence(d: &[DiffMessage], margin: &[f64], tie: &[bool], e: usize
     }
 }
 
+/// Calculates the match quality of the given rating groups. A result is the draw probability in the association
 pub fn quality(rating_groups: &[&[Gaussian]], beta: f64) -> f64 {
     let flatten_ratings = rating_groups
         .iter()