Add instructions for adding midnam files.

git-svn-id: svn://localhost/ardour2/branches/3.0@13901 d708f5d6-7413-0410-9779-e7cbd77b26cf

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+Please preserve the following when adding files here:
+
+All documents except the two standard MIDI ones have the conventional naming
+scheme Manufacturer_Model.midnam, with spaces replaced with underscores.
+
+All documents validate against MIDINameDocument10.dtd.  Please ensure any
+changes or additions do not break the documents.  To check, run:
+
+xmllint --dtdvalid MIDINameDocument10.dtd My_Device.midnam > /dev/null
+
+The same tool can be used to format the file nicely:
+
+xmllint --format My_Device.ugly.midnam > My_Device.midnam