update readme.md about introduction and rename subtitle.

For-ACGN · web-flow · commit 9e34beaca38e · 2025-03-20T21:53:38.000+08:00
diff --git a/README.md b/README.md
@@ -1,7 +1,7 @@
 # GRT-Config
-A package for configure Gleam-RT options and Encode/Decode argument stub. 
+A package for deep customization of Gleam-RT. 
 
-## Usage
+## option and argument
 ```go
 package main
 
