update readme

README.md

@@ -1,6 +1,7 @@
 # Go Application Template
 
 ## Structure
+```
 my-app/
 ├── cmd/
 │   └── app1/          # Individual target binary. Duplicate as needed
@@ -10,6 +11,7 @@ my-app/
     └── pkg1/          # Internal use package. Duplicate as needed
         ├── pgk1.go
         └── pgk1_test.go
+```
 
 ## Use
 - `git clone git.develent.net/wiharb/go-template-app.git [project-name]`