Add author, copyright and license, closes #81

[jhthorsen]

I suggest using MIT, since it's a widely used license for Javascript projects. mend.io (from 2022) states that "The Apache 2.0 License Takes The Lead", with MIT as the second most popular license. I still think MIT is the best choice, since it's more familiar (IMO) to many users.

You can see the license description in LICENSE.md in this PR, but here are some things I like about it:

• It allows anyone to use the software in any form they want.
• It requires anyone who copies the project to continue to use the MIT license.
• It states that there is no warranty.

I also added "copyright", "author" and "description". "description" is not strictly related to this issue, but "copyright" and "author" is important to add at the same time.

Reference: #81.

[ankurrsinghal]

Thanks @jhthorsen for the PR, merging it now. :)

[jhthorsen]

That's great! Thank you for the quick response 👍