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/MAINTAINERS b/MAINTAINERS
index 03b615e..f7855c2 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -45,3 +45,4 @@
 M:  Lei Yu <mine260309@gmail.com> <LeiYU!>
 M:  Carol Wang <wangkair@cn.ibm.com> <CarolWang!>
 R:  Chicago Duan <duanzhijia01@inspur.com> <ChicagoDuan!>
+R:  Matt Spinler <spinler@us.ibm.com> <mspinler[m]!>