Add an API option to create certificate files

[xavierfoucrier]

Currently, files are not being created when using the package through createCa / createCert.

[Subash]

The api outputs certificate text that you can write to a file with fs.writeFile

[xavierfoucrier]

Hello @Subash,

I know and discovered that during development. For me the package/api should have same behavior as CLI commands and should result in file creation.

But may be you have another point of view/argument about not introducing such feature inside mkcert. Let me know 😉