📝 docs(vuepress): setup vuepress

Author: kazupon

docs/.vuepress/config.js

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+'use strict'
+
+const { withCategories } = require('../../scripts/lib/rules')
+require('../../scripts/update-docs-headers')
+require('../../scripts/update-docs-index')
+
+module.exports = {
+  base: '/eslint-plugin-vue-i18n/',
+  title: 'eslint-plugin-vue-i18n',
+  description: 'ESLint plugin for Vue I18n',
+  serviceWorker: false,
+  themeConfig: {
+    repo: 'kazupon/eslint-plugin-vue-i18n',
+    docsDir: 'docs',
+    docsBranch: 'master',
+    editLinks: true,
+    search: false,
+    sidebarDepth: 0,
+    sidebar: {
+      '/': [
+        '/',
+        '/rules/',
+        ...withCategories.map(({ category, rules }) => ({
+          title: `Rules in ${category}`,
+          collapsable: false,
+          children: rules.map(rule => `/rules/${rule.name}`)
+        }))
+      ]
+    }
+  }
+}

docs/README.md

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+# Getting Started
+
+## :cd: Installation
+
+Use [npm](https://www.npmjs.com/) or a compatible tool.
+
+```sh
+npm install --save-dev eslint eslint-plugin-vue-i18n
+```
+
+## :rocket: Usage
+
+Configure your `.eslintrc.*` file.
+
+For example:
+
+```json
+{
+  "extends": [
+    "eslint:recommended",
+    "plugin:vue-i18n/recommended"
+  ],
+  "rules": {
+    // Optional.
+    "vue-i18n/no-missing-key": "error"
+  }
+}
+```