feat: add @jy/util example

packages/util/index.js

@@ -0,0 +1 @@
+export * from './modules/format'

packages/util/modules/format/index.js

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+/**
+ * 示例： 用于为金额添加后缀单位展示
+ * @param money - 金额
+ * @returns {string}
+ */
+function formatMoney (money) {
+    return money + '万元'
+}
+
+export {
+    formatMoney
+}

packages/util/package.json

@@ -0,0 +1,12 @@
+{
+  "name": "@jy/util",
+  "version": "0.0.1",
+  "description": "剑鱼项目通用工具集",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC"
+}