Add TypeScript definition

[Akim95]

Feel free to contribute and keep it improving!

[sindresorhus]

Thanks for creating a TypeScript definition. 🙌 Can you follow this styleguide?

Some examples:

• https://github.com/sindresorhus/semver-regex/commit/039944bb5b3876913171b895488874b5c200e458
• https://github.com/sindresorhus/global-dirs/commit/0aae4d64887f77af94c4fb7ca12aa9f93c0a8291
• https://github.com/sindresorhus/md5-hex/commit/bbbfeff840f26973fbffc16d4863ae6d120079f3

[sindresorhus]

You need to wrap the options type in a namespace, see https://github.com/sindresorhus/typescript-definition-style-guide#documentation

[sindresorhus]

You still need to do https://github.com/chalk/ansi-regex/pull/32#issuecomment-537818686 and use tab-indentation.

[sindresorhus]

Thanks :)

[Akim95]

Welcome! :D