Include README file into the library build

[GomezIvann]

Checklist

• [x] Build process is done without errors. All tests pass in the /lib directory.
• [x] Self-reviewed the code before submitting.
• [x] Meets accessibility standards.
• [x] Added/updated documentation to /website as needed.
• [x] Added/updated tests as needed.

Purpose Add the README.md of Halstack to the build of the library, so it appears on our npm page.

Description Added copy-readme.js file to the /scripts folder and execute it in the build process.