docs: add missing tests directory

kenjis · kenjis · commit db1833a950f5 · 2022-08-07T19:55:02.000+09:00
diff --git a/user_guide_src/source/installation/installing_manual.rst b/user_guide_src/source/installation/installing_manual.rst
@@ -55,7 +55,8 @@ Structure
 =========
 
 Folders in your project after set up:
-app, public, system, writable
+
+- app, public, tests, writable, system
 
 Translations Installation
 =========================
