Add libraries page.

I've added simple page with list of libraries which can be useful for web development with Luminus to privide people who are new to Clojure web stack ideas what they can use for templating, database access, authentication and other aspects of webdev. Based on clojure-toolbox.com with minor additions. Basically it's just an idea, list can be expanded and improved in future.
Any suggestions about content and naming are welcome.