Add VTY reference manual

Fixes: OS#2589
Change-Id: I042734fa9979b598d5471839e408cbf39bba57b5
diff --git a/doc/manuals/Makefile.am b/doc/manuals/Makefile.am
new file mode 100644
index 0000000..91aa8f8
--- /dev/null
+++ b/doc/manuals/Makefile.am
@@ -0,0 +1,12 @@
+EXTRA_DIST = \
+	     osmohnbgw-vty-reference.xml \
+	     regen_doc.sh \
+	     vty
+
+if BUILD_MANUALS
+  VTY_REFERENCE = osmohnbgw-vty-reference.xml
+  include $(OSMO_GSM_MANUALS_DIR)/build/Makefile.vty-reference.inc
+
+  OSMO_REPOSITORY = osmo-hnbgw
+  include $(OSMO_GSM_MANUALS_DIR)/build/Makefile.common.inc
+endif