add phpdoc readme

hs040x · hs040x · commit e790f1715e89 · 2019-01-20T00:23:33.000+01:00
diff --git a/readme.md b/readme.md
@@ -26,6 +26,12 @@ composer install
 composer test
 ```
 
+## How to generate `phpdoc`
+
+```
+composer doc
+```
+
 ## Others Links
 
 - https://sourcemaking.com/design_patterns
