Add Larmor Parameters file

It includes the parameter that tells Mantid to load the detectors positions
(parameter map) form the Nexus file.

re #7998

Code/Mantid/instrument/LARMOR_Parameters.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8" ?>
+<parameter-file instrument = "LARMOR" valid-from = "2013-10-03T11:30:00">
+<component-link name = "LARMOR">
+
+<!-- Specify that the detector positions should be taken from the data file -->
+<parameter name="det-pos-source" type="string">
+  <value val="datafile-ignore-phi"/>
+</parameter>
+
+</component-link>
+
+</parameter-file>