Add LICENSE file and terms for contributing (#193)

* Add LICENSE file

* Add note on contribution licensing

CONTRIBUTING.md

@@ -12,6 +12,7 @@ Documentation on how to run this project locally and add more components.
 - [Linting and Formatting](#linting-and-formatting)
 - [Pull request guidance](#pull-request-guidance)
 - [Publishing to npm](#publishing-to-npm)
+- [Contribution licensing](#contribution-licensing)
 
 ## Getting started
 
@@ -364,3 +365,7 @@ If any changes were made to the src files, be sure to [build to dist](#getting-s
    ```bash
    npm publish
    ```
+
+## Contribution licensing
+
+All contributions to this project will be released under the same MIT License as the overall project. By submitting a pull request, you are agreeing to comply with these terms.

LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2022 California Institute of Technology (Caltech). U.S. Government sponsorship acknowledged.
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.