Wrote part of configuration chapter

device-config
bridging-unicast
xconnect
pseudowire

Change-Id: Ib393d52e7bdc606c705e1e14dd52c9fcd77c0755
diff --git a/configuration/route-service.rst b/configuration/route-service.rst
new file mode 100644
index 0000000..d776deb
--- /dev/null
+++ b/configuration/route-service.rst
@@ -0,0 +1,8 @@
+Route Service
+=============
+
+Static routes
+-------------
+
+Route blackholing
+-----------------