Added license

Derived from first page of OGC's pdf version of the draft specification

LICENSE.md

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+**Copyright notice:**
+
+Copyright © 2012.Envitia
+Copyright © 2012.Luciad
+Copyright © 2012 Sigma Bravo.
+Copyright © 2012 The Carbon Project.
+Copyright © 2012 U.S. Army Geospatial Center.
+Copyright © 2012 U.S. National Geospatial Intelligence Agency.
+
+The companies listed above have granted the Open Geospatial Consortium, Inc. (OGC) a nonexclusive, 
+royalty-free, paid up, worldwide license to copy and distribute this document and to modify this 
+document and distribute copies of the modified version. To obtain additional rights of use, 
+visit http://www.opengeospatial.org/legal/.
+
+**Warning:**
+
+This document is not an OGC Standard. It is distributed for review and comment. It is subject to 
+change without notice and MAY not be referred to as an OGC Standard.
+
+Recipients of this document are invited to submit, with their comments, notification of any relevant 
+patent rights of which they are aware and to provide supporting documentation.