Adding an official LICENSE file to the top level directory (#738)

TYPE: text only

KEYWORDS: license

SOURCE: internal

DESCRIPTION OF CHANGES: This license is simply our public domain notice on our web pages. We do not have a copyright for WRF, so that is not necessary to include. This will serve as our license unless/until the time comes that we must update to a specific type required by NSF.

LIST OF MODIFIED FILES:
A LICENSE.txt

TESTS CONDUCTED: none

RELEASE NOTE: No note necessary.

LICENSE.txt

@@ -0,0 +1,3 @@
+WRF was developed at the National Center for Atmospheric Research (NCAR) which is operated by the University Corporation for Atmospheric Research (UCAR). NCAR and UCAR make no proprietary claims, either statutory or otherwise, to this version and release of WRF and consider WRF to be in the public domain for use by any person or entity for any purpose without any fee or charge. UCAR requests that any WRF user include this notice on any partial or full copies of WRF. WRF is provided on an "AS IS" basis and any warranties, either express or implied, including but not limited to implied warranties of non-infringement, originality, merchantability and fitness for a particular purpose, are disclaimed. In no event shall UCAR be liable for any damages, whatsoever, whether direct, indirect, consequential or special, that arise out of or in connection with the access, use or performance of WRF, including infringement actions.
+
+WRF® is a registered trademark of the University Corporation for Atmospheric Research (UCAR).