Add support for Clojure

[vhawk19]

From what i understand prybar-clojure uses clojure-cli tools and deps.edn, would upm support clojure librarie either using deps.edn or lein(using project.clj). I see that as my primary limiting factor while using clojure on repl.it unlike python/dart where I can import libraries with ease.

[ghost]

deps.edn requires an alias to be defined in order to run a clojure program. Should a deps project initialized with upm add this alias? Should upm create the main source file for that alias as well? i.e. Generate a void main() for clojure.

[Billcab]

Having trouble creating alias as I am trying to digitize object of file conflicts in programming languages