docs: add maintenance status (#2044)

* docs: add maintenance status

* docs: update

* docs: update roadmap

.npmrc

@@ -1,2 +1,2 @@
 public-hoist-pattern[]='@vue/*'
-strict-peer-dependencies=false
+strict-peer-dependencies=false

docs/.vitepress/config.mts

@@ -67,7 +67,7 @@ function nav() {
     },
     {
       text: 'Version',
-      items: [{ text: 'v8.x', link: 'https://kazupon.github.io/vue-i18n/' }]
+      items: [{ text: 'Maintenance Status', link: '/guide/extra/maintenance' }, { text: 'v8.x', link: 'https://kazupon.github.io/vue-i18n/' }]
     },
     {
       text: 'Changelog',
@@ -224,6 +224,10 @@ function sidebarGuide() {
       text: 'Extra Topics',
       collapsible: true,
       items: [
+        {
+          text: 'Maintenance Status',
+          link: '/guide/extra/maintenance'
+        },
         {
           text: 'Different Distribution files',
           link: '/guide/extra/dist'

docs/guide/extra/maintenance.md

@@ -0,0 +1,13 @@
+# Maintenance Status
+
+Vue I18n and related intlify packages has a lifecycle.
+
+The following is the maintenance status for each version:
+
+<img src="/lifecycle2024.svg" alt="Vue I18n Maintenance Status" />
+
+> [!IMPORTANT]
+The lifecycle of Vue I18n v10 has not yet been decided. It will be decided after the release of Vue I18n v11.
+
+> [!NOTE]
+The lifecycle period after v10 may change depending on the frequency of major releases.

docs/guide/introduction.md

@@ -37,6 +37,10 @@ const members = [
 
 # What is Vue I18n?
 
+:::tip NOTE
+If you would like to know more about the maintenance status of each version of Vue I18n, please see [here](./extra/maintenance).
+:::
+
 :::tip NOTE
 Already know Vue I18n v8.x and just want to learn about what’s new in Vue I18n v9? Check out the [Migration Guide](./migration/breaking)!
 :::