Merge pull request #2 from aj-stein-gsa/chore-add-license

Add LICENSE with CC0 for public domain use

LICENSE.md

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+# This project is in the worldwide public domain
+
+This work is made available in the public domain worldwide using the [CC0 1.0 Universal public domain dedication](https://creativecommons.org/publicdomain/zero/1.0/).
+
+## CC0 1.0 Universal Summary
+
+This is a human-readable summary of the [Legal Code (read the full text)](https://creativecommons.org/publicdomain/zero/1.0/legalcode).
+
+### No Copyright
+
+The person who associated a work with this deed has dedicated the work to the public domain by waiving all of his or her rights to the work worldwide under copyright law, including all related and neighboring rights, to the extent allowed by law.
+
+You can copy, modify, distribute and perform the work, even for commercial purposes, all without asking permission.
+
+### Other Information
+
+In no way are the patent or trademark rights of any person affected by CC0, nor are the rights that other persons may have in the work or in how the work is used, such as publicity or privacy rights.
+
+Unless expressly stated otherwise, the person who associated a work with this deed makes no warranties about the work, and disclaims liability for all uses of the work, to the fullest extent permitted by applicable law. When using or citing the work, you should not imply endorsement by the author or the affirmer.
+
+## Contributions to this project
+
+As stated in [CONTRIBUTING](CONTRIBUTING.md), all contributions to this project will be released under the CC0 dedication. By submitting a pull request, you are agreeing to comply with this waiver of copyright interest.
+
+## Related prior work
+
+The contents of this repository is based on work from the [Metaschema Java repository](https://github.com/usnistgov/oscal-cli/) maintained by the National Institute of Standards and Technology (NIST), the [contents of which have been dedicated in the worldwide public domain](https://github.com/usnistgov/oscal-cli/blob/1d4f38d6b73ec34469063e2a90be69367f8d8996/LICENSE.md) using the [CC0 1.0 Universal](https://creativecommons.org/publicdomain/zero/1.0/) public domain dedication. This repository builds on this prior work, maintaining the [CCO license](https://github.com/metaschema-framework/oscal-cli/blob/main/LICENSE.md) on any new works in this repository.