update readme and contributing document with building instructions

Author: peterwoodworth

CONTRIBUTING.md

@@ -6,6 +6,10 @@ documentation, we greatly value feedback and contributions from our community.
 Please read through this document before submitting any issues or pull requests to ensure we have all the necessary
 information to effectively respond to your bug report or contribution.
 
+## Building the Entrypoint File
+
+The file that Github reads is `lib/index.js`. This is an autogenerated file built from the files found in `src`. To build the entrypoint file, run `npm run build` after all changes in `src` have been made.
+
 
 ## Reporting Bugs/Feature Requests
 

README.md

@@ -77,6 +77,11 @@ jobs:
           excluded-expressions: "[ TypeScript | Java | Python ]"
 ```
 
+
+## Contributing
+
+We welcome community contributions and pull requests. See [CONTRIBUTING.md](./CONTRIBUTING.md) for information on how to contribute to this project
+
 ## Security
 
 See [CONTRIBUTING](CONTRIBUTING.md#security-issue-notifications) for more information.