chore: move files to be included in npm package

[BlankParticle]

Currently the npm package doesn't have its README or License included in the package. I have moved README and License in the actual folder and symlinked them into the project root. Many popular projects do this, so I think it is good.

[vercel]

Deployment failed with the following error:

Resource is limited - try again in 5 hours (more than 100, code: "api-deployments-free-per-day").

[pacocoursey]

I'm assuming that GitHub will correctly render the README in the repo even though it's a symlink?

[vercel]

Deployment failed with the following error:

Resource is limited - try again in 3 hours (more than 100, code: "api-deployments-free-per-day").