Add sample config file

Also added documentation on how to use these config files

Change-Id: Ic8080bbdceb28da27af521020e671244df452ee4
Bug: 213446344
diff --git a/example_config.json b/example_config.json
new file mode 100644
index 0000000..7489840
--- /dev/null
+++ b/example_config.json
@@ -0,0 +1,6 @@
+{
+    "env": {
+	"ENV_VAR_1": "Value1",
+	"ENV_VAR_2": "Value2"
+    }
+}