Add option to create clojure file (namespace)

[afucher]

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Is your feature request related to a problem? Please describe. When need to create a new clojure file it does not have the proper action, so need to create a generic file with clj extension. This could lead to errors while using - instead of _ on file names.

Describe the solution you'd like Have a dedicated action to create clojure files (namespace) with proper validation on name.