Initial build for psu code manager

Add initial meson build env, empty c++ files, and the systemd service.
Add README and .gitignore
Add Matt as reviewer.

Tested: Verify build is OK and the service is installed to the correct
        dir.

Signed-off-by: Lei YU <mine260309@gmail.com>
Change-Id: I21c060d2b98e8eafd4607cfce09038189e76d22f
diff --git a/service/xyz.openbmc_project.Software.Psu.Updater.service b/service/xyz.openbmc_project.Software.Psu.Updater.service
new file mode 100644
index 0000000..7597e7c
--- /dev/null
+++ b/service/xyz.openbmc_project.Software.Psu.Updater.service
@@ -0,0 +1,15 @@
+[Unit]
+Description=OpenBMC PSU Code Manager
+Wants=xyz.openbmc_project.Software.Version.service
+After=xyz.openbmc_project.Software.Version.service
+Wants=obmc-mapper.target
+After=obmc-mapper.target
+
+[Service]
+ExecStart=/usr/bin/phosphor-psu-code-manager
+Restart=always
+Type=dbus
+BusName={BUSNAME}
+
+[Install]
+WantedBy=multi-user.target