Adds new class to API ref

Author: spjuhel

doc/api/climada/climada.entity.rst

@@ -6,6 +6,7 @@ climada\.entity package
     climada.entity.disc_rates
     climada.entity.exposures
     climada.entity.impact_funcs
+    climada.entity.measures
     climada.entity._legacy_measures
 
 climada\.entity\.entity\_def module

doc/api/climada/measures.rst

@@ -0,0 +1,14 @@
+climada\.entity\.measures package
+=================================
+
+.. note::
+   This package implements the new way of defining measures.
+   For the previous way, see :ref:`climada.entity._legacy_measures`
+
+climada\.entity\.measures\.measure_config module
+------------------------------------------------
+
+.. automodule:: climada.entity.measures.measure_config
+    :members:
+    :undoc-members:
+    :show-inheritance: