Add basic phosphor-psu-monitor application

Change-Id: I3f892e6789c9b081aea04668de6fe0155963d521
Signed-off-by: Brandon Wyman <bjwyman@gmail.com>
diff --git a/meson.build b/meson.build
index 210ae7f..57630a2 100644
--- a/meson.build
+++ b/meson.build
@@ -86,6 +86,7 @@
 subdir('phosphor-regulators')
 subdir('power-sequencer')
 subdir('power-supply')
+subdir('phosphor-power-supply')
 subdir('tools/power-utils')
 subdir('test')
 subdir('cold-redundancy')