You have a bunch of mp3s.
You want a podcast.
On a Mac with Ruby 2.x and Bundler installed:
$ bundle install
$ bundle exec ruby folder2podcast.rb
$ open http://0.0.0.0:4567/Works great with Downcast for loading a bunch of mp3s. It would probably also work with Instacast, iTunes, etc. as long as you're on the same network. Not intended for any production use, just for loading a bunch of mp3s for yourself.