add npm script to simplify running cli program

Author: FarrelAD

package.json

@@ -20,7 +20,8 @@
     "globals": "^15.14.0"
   },
   "scripts": {
-    "test": "echo \"Error: no test specified\" && exit 1"
+    "test": "echo \"Error: no test specified\" && exit 1",
+    "cli": "node src/cli/main.js"
   },
   "repository": {
     "type": "git",