Add initial OsmoMGW manual

Change-Id: I1b4ff96309d280c6a63105a6e06a82ec2e7b6908
diff --git a/doc/manuals/osmomgw-usermanual-docinfo.xml b/doc/manuals/osmomgw-usermanual-docinfo.xml
new file mode 100644
index 0000000..d801c9b
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+++ b/doc/manuals/osmomgw-usermanual-docinfo.xml
@@ -0,0 +1,47 @@
+<revhistory>
+  <revision>
+    <revnumber>1</revnumber>
+    <date>July 24th, 2018</date>
+    <authorinitials>DW</authorinitials>
+    <revremark>
+      Initial version
+    </revremark>
+  </revision>
+</revhistory>
+
+<authorgroup>
+  <author>
+    <firstname>Daniel</firstname>
+    <surname>Willmann</surname>
+    <email>dwillmann@sysmocom.de</email>
+    <authorinitials>DW</authorinitials>
+    <affiliation>
+      <shortaffil>sysmocom</shortaffil>
+      <orgname>sysmocom - s.f.m.c. GmbH</orgname>
+    </affiliation>
+  </author>
+</authorgroup>
+
+<copyright>
+  <year>2018</year>
+  <holder>sysmocom - s.f.m.c. GmbH</holder>
+</copyright>
+
+<legalnotice>
+  <para>
+	Permission is granted to copy, distribute and/or modify this
+	document under the terms of the GNU Free Documentation License,
+	Version 1.3 or any later version published by the Free Software
+	Foundation; with the Invariant Sections being just 'Foreword',
+	'Acknowledgements' and 'Preface', with no Front-Cover Texts,
+	and no Back-Cover Texts.  A copy of the license is included in
+	the section entitled "GNU Free Documentation License".
+  </para>
+  <para>
+	The Asciidoc source code of this manual can be found at
+	<ulink url="http://git.osmocom.org/osmo-gsm-manuals/">
+		http://git.osmocom.org/osmo-gsm-manuals/
+	</ulink>
+  </para>
+</legalnotice>
+