Added implementation in common lisp with unit-test

- added the existing implementation in common lisp with system-definition
- added a parachute-unit-test
- added a description for setup and running the unit-tests
- added a description for stubbing and mocking with cl-mock

common-lisp-parachute/gilded-rose.asd

@@ -0,0 +1,20 @@
+;;;; gilded-rose.asd
+
+(defsystem "gilded-rose"
+  :description "Gilded Rose is a small inn selling the finest goods."
+  :author "Leeroy <leeroy@gilded-rose.com>"
+  :version "1.0.0"
+  :pathname "source/"
+  :components ((:file "package")
+               (:file "gilded-rose" :depends-on ("package")))
+  :in-order-to ((test-op (test-op "gilded-rose/tests"))))
+
+(defsystem "gilded-rose/tests"
+  :description "Unit tests for gilded-rose-package"
+  :author "Leeroy <leeroy@gilded-rose.com>"
+  :version "1.0.0"
+  :depends-on ("gilded-rose" "parachute" "cl-mock")
+  :pathname "tests/"
+  :components ((:file "package")
+	       (:file "tests" :depends-on ("package")))
+  :perform (test-op (o c) (symbol-call :parachute :test :gilded-rose-tests)))