Update readme.md

ximing · Jul 14, 2023 · 1a5acb7 · 1a5acb7
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@@ -7,7 +7,13 @@
 
 https://www.ecma-international.org/wp-content/uploads/ECMA-262_5th_edition_december_2009.pdf
 
-## 支持能力
+## 使用方法
+```bash
+npm i -S jsvm2
+```
+参考 [__tests__/helper.ts](__tests__/helper.ts)
+
+## 语法支持情况
 
 注：引擎表现为严格模式