regulators: Create Configuration class

Create C++ class that implements the 'configuration' element from the
JSON config file.  See configuration.md for more information.

The execute() method of this class will be implemented in a future
commit.

Signed-off-by: Shawn McCarney <shawnmm@us.ibm.com>
Change-Id: I9a8e2774e110ef56b2e23c46be6830a6e1275cc6
diff --git a/phosphor-regulators/test/meson.build b/phosphor-regulators/test/meson.build
index 8cee4e7..0220532 100644
--- a/phosphor-regulators/test/meson.build
+++ b/phosphor-regulators/test/meson.build
@@ -4,6 +4,7 @@
 )
 
 phosphor_regulators_tests_source_files = [
+    'configuration_tests.cpp',
     'device_tests.cpp',
     'id_map_tests.cpp',
     'pmbus_error_tests.cpp',