[CB-3024] expanded help string for cl create script

bin/create

@@ -25,8 +25,11 @@ set -e
 
 if [ -z "$1" ] || [ "$1" == "-h" ]
 then
-    echo 'usage: create path package activity'
+    echo "Usage: $0 <path_to_new_project> <package_name> <project_name>"
     echo "Make sure the Android SDK tools folder is in your PATH!"
+    echo "    <path_to_new_project>: Path to your new Cordova iOS project"
+    echo "    <package_name>: Package name, following reverse-domain style convention"
+    echo "    <project_name>: Project name"
     exit 0
 fi