Add initial OsmoMGW manual

Change-Id: I1b4ff96309d280c6a63105a6e06a82ec2e7b6908
diff --git a/doc/manuals/osmomgw-usermanual.adoc b/doc/manuals/osmomgw-usermanual.adoc
new file mode 100644
index 0000000..69dc005
--- /dev/null
+++ b/doc/manuals/osmomgw-usermanual.adoc
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+:gfdl-enabled:
+:program-name: OsmoMGW
+
+OsmoMGW User Manual
+====================
+Daniel Willmann <dwillmann@sysmocom.de>
+
+
+include::../common/chapters/preface.adoc[]
+
+include::chapters/overview.adoc[]
+
+include::chapters/running.adoc[]
+
+include::../common/chapters/vty.adoc[]
+
+include::../common/chapters/logging.adoc[]
+
+include::chapters/configuration.adoc[]
+
+//include::chapters/counters.adoc[]
+
+include::../common/chapters/port_numbers.adoc[]
+
+include::../common/chapters/bibliography.adoc[]
+
+include::../common/chapters/glossary.adoc[]
+
+include::../common/chapters/gfdl.adoc[]
+
+