Add example interfaces

Add example interfaces for testing.
Add a script that generates sdbusplus bindings for example interfaces.

Change-Id: I683ce9dca74d827d226833ed8a56f87243914e04
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/example/interfaces.yaml b/example/interfaces.yaml
new file mode 100644
index 0000000..56b6198
--- /dev/null
+++ b/example/interfaces.yaml
@@ -0,0 +1,2 @@
+- xyz.openbmc_project.Example.Iface1
+- xyz.openbmc_project.Example.Iface2