docs(readme): add CLI usage

azu · azu · commit 1f50eddb2b8f · 2016-02-15T09:21:32.000+09:00
diff --git a/README.md b/README.md
@@ -25,6 +25,10 @@ Via `.textlintrc`(Recommended)
 
 Via CLI
 
+```sh
+$ textlint --rule alex README.md
+```
+
 ## Options
 
 ### `allow`
