Update the doc

Author: Guillaume Lemaitre

doc/api.rst

@@ -119,6 +119,26 @@ Functions
 
    pipeline.make_pipeline
 
+.. _metrics_ref:
+
+Metrics
+=======
+
+.. automodule:: imblearn.metrics
+   :no-members:
+   :no-inherited-members:
+
+.. currentmodule:: imblearn
+
+Functions
+---------
+.. autosummary::
+:toctree: generated/
+   metrics.sensitivity_specificity_support
+   metrics.sensitivity_score
+   metrics.specificity_score
+   metrics.geometric_mean_score
+   metrics.indexed_balanced_accuracy_score
 
 .. _datasets_ref:
 

doc/whats_new.rst

@@ -28,6 +28,7 @@ New features
 ~~~~~~~~~~~~
 
 - Added AllKNN under sampling technique. By `Dayvid Oliveira`_.
+- Added a module `metrics` implementing some specific scoring function for the problem of balancing. By `Guillaume Lemaitre`_ and `Christos Aridas`_.
 
 Enhancement
 ~~~~~~~~~~~