Kb importer for Learning Paths

Hi Sergio,

Here's the importer that I've created and tested on our Learning Paths directory structure in liferay-docs.

I'll share a ZIP file with you that you can use to test it.

Note, I had the portlet throw an exception for any file entry (file in the ZIP file) it can't convert. This is really helpful for us to resolve issues in the Markdown files in case anything fails to import.

Thanks for reviewing!
Jim