📝 docs: add some tips

docs/.vitepress/config/common.ts

@@ -1,7 +1,7 @@
 // 共有配置项，导入index用
-
 import {defineConfig} from 'vitepress'
 import {generateSidebar} from 'vitepress-sidebar';
+import {useData} from "vitepress";
 import {zh} from "./zh";
 import {en} from "./en";
 import {ja} from "./ja";

docs/.vitepress/theme/index.ts

@@ -1,4 +1,29 @@
 import DefaultTheme from 'vitepress/theme-without-fonts'
+import Theme from 'vitepress/theme'
+import {createI18n} from 'vue-i18n'
 import './fonts.css'
 
-export default DefaultTheme
+const i18n = createI18n({
+    // something vue-i18n options here ..
+    messages: {
+        en: {
+            tip: "TIP",
+        },
+        ja: {
+            tip: "ヒント",
+        },
+        zh: {
+            tip: "提示",
+        },
+        zht: {
+            tip: "提示",
+        }
+    }
+})
+
+export default {
+    extends: Theme,
+    enhanceApp({app}) {
+        app.use(i18n)
+    }
+}

docs/zh/refer/7-differential-euqtion/index.md

@@ -0,0 +1,5 @@
+---
+title: 微分方程
+---
+
+# 微分方程