averez-doc: adding nxlog-syslog configuration snippet

examples/nxlog-syslog/README.md

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+# beaver-syslog
+
+This configuration for [nxlog](http://nxlog-ce.sourceforge.net) ships syslog logs stored in `/var/log/*.log` to mozdef.
+
+To run it:
+
+```
+cp nxlog.conf /etc/nxlog/
+sudo service nxlog restart
+```

examples/nxlog-syslog/nxlog.conf

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+<Extension syslog>
+    Module      xm_syslog
+</Extension>
+<Extension json>
+    Module    xm_json
+</Extension>
+CacheDir   /tmp/nxlog
+PidFile    "nxlog.pid"
+
+<Input in>
+    Module        im_file
+    File        '/var/log/*.log'
+    ReadFromLast    TRUE
+    Exec            parse_syslog(); to_json();
+</Input>
+<Output outes>
+    Module        om_http
+    URL            http://mozdef.example.com:8080/nxlog/
+</Output>
+
+<Route httpout>
+    Path    in => buffer=>outes,outfile
+</Route