Update LICENSE per guidance from OWP PMO

LICENSE

@@ -1,7 +1,22 @@
-“Software code created by U.S. Government employees is not subject to copyright
-in the United States (17 U.S.C. §105). The United States/Department of Commerce
-reserve all rights to seek and obtain copyright protection in countries other
-than the United States for Software authored in its entirety by the Department
-of Commerce. To this end, the Department of Commerce hereby grants to Recipient
-a royalty-free, nonexclusive license to use, copy, and create derivative works
-of the Software outside of the United States.”
+Licensed under the Apache License, Version 2.0 (the “License”);
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an “AS IS” BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
+express or implied.
+
+See the License for the specific language governing permission and
+limitations under the License.
+
+- - - - - - - - - - - - - -
+
+“Software code created by U.S. Government employees is not subject to copyright in the
+United States (17 U.S.C. §105). The United States/Department of Commerce reserves all
+rights to seek and obtain copyright protection in countries other than the United States
+for Software authored in its entirety by the Department of Commerce. To this end, the
+Department of Commerce hereby grants to Recipient a royalty-free, nonexclusive license
+to use, copy, and create derivative works of the Software outside of the United States.”