Added Clojure code kata

Resolves: #1

clojure/.gitignore

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+/target
+/classes
+/checkouts
+pom.xml
+pom.xml.asc
+*.jar
+*.class
+/.lein-*
+/.nrepl-port
+.hgignore
+.hg/

clojure/README.md

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+# Code Kata clojure!
+
+Clojure is a LISP style functional language for the JVM, it can be transpiled to JavaScript, or compiled for the CLR. But
+more commonly it is intended for the JVM.
+
+This clojure project initialised using lein. To run this project:
+* Add the clojure plugin to intellij IDEA. Intellij will then be able to download the other required jars.
+* make `lein` executable.
+* run `./lein` or `lein.bat` this will set up the project locally.
+
+# Run tests
+
+Tests do not run as expected in IntelliJ. Instead use `lein test`.
+
+It is also possible to test a single test, helpfully `lein` provides this command on test execution failure, allowing 
+any particular test to be re-run from the command line.
+