docs: add spark file

kenjis · kenjis · commit a2aed177b409 · 2021-12-02T10:56:49.000+09:00
diff --git a/user_guide_src/source/general/managing_apps.rst b/user_guide_src/source/general/managing_apps.rst
@@ -51,11 +51,13 @@ and **bar**. You could structure your application project directories like this:
         /public
         /tests
         /writable
+        spark
     /bar
         /app
         /public
         /tests
         /writable
+        spark
     /codeigniter
         /system
 
