example: create calculator server app

Change-Id: Ie2ad4ff00208056c48c0d596053b20b82f1fb3a1
Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
diff --git a/Makefile.am b/Makefile.am
index 2a24517..288b0a8 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -43,4 +43,4 @@
 pkgconfiglib_DATA = sdbusplus.pc
 
 endif
-SUBDIRS = test tools
+SUBDIRS = . tools example test