Added license.md file.

LICENSE.md

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+Copyright 2022, Battelle Memorial Institute.
+
+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
+
+The patent license grant shall only be applicable to the following patent and patent application (Battelle IPID 17008-E), as assigned to the Battelle Memorial Institute, as used in conjunction with this Work:  US Patent No. 9,094,385, issued 7/28/15  USPTO Patent App. No. 14/746,577, filed 6/22/15, published as US 2016-0006569.
+
+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 permissions and limitations under the License.