Add license terms to this codebase

LICENSE

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+DSpace source code BSD License:
+
+Copyright (c) 2002-2020, LYRASIS.  All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+- Redistributions of source code must retain the above copyright
+notice, this list of conditions and the following disclaimer.
+
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+
+- Neither the name DuraSpace nor the name of the DSpace Foundation
+nor the names of its contributors may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
+TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
+USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
+DAMAGE.
+
+
+DSpace uses third-party libraries which may be distributed under
+different licenses to the above. Information about these licenses
+is detailed in the LICENSES_THIRD_PARTY file at the root of the source
+tree.  You must agree to the terms of these licenses, in addition to
+the above DSpace source code license, in order to use this software.

LICENSES_THIRD_PARTY

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+
+DSpace uses third-party libraries which may be distributed under different licenses.
+A summary of all third-party, production dependencies used by this user interface may be found by running:
+
+    npx license-checker --production --summary
+
+You must agree to the terms of these licenses, in addition to the DSpace source code license, in order to use this
+software.
+
+PLEASE NOTE: Some third-party dependencies may be listed under multiple licenses if they are dual-licensed.
+This is especially true of anything listed as GPL (or similar), as DSpace does NOT allow for the inclusion of
+any dependencies that are solely released under GPL (or similar) terms. For more info see:
+https://wiki.lyrasis.org/display/DSPACE/Code+Contribution+Guidelines#CodeContributionGuidelines-LicensingofContributions