Change to Apache-2.0 licence and add licence file to repository

[geofflamrock]

This PR changes the licence noted in package.json from ISC to Apache-2.0 to match our other public repositories and adds a licence file to the repository so it can be seen.

Fixes #119

How to review

• Are there any concerns with the change of licence within package.json?
  • The original ISC licence really only came about by a default setting when creating the npm package.
  • The repository is very recent and has no forks currently, and this change aligns the licence usage with our other repositories, but not sure if there is anything else to be aware of here.
  • There also isn't any npm package that is published from this repo, so potentially no real impact in that regard.
• Is it worth considering noting this change in release notes with a minor version bump?

[changeset-bot]

⚠️ No Changeset found

Latest commit: ce77d98

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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[dylanlerch]

I feel like the change is fine, but I also don't have any expertise, so won't be offended if you want a second opinion. 😄