docs: add documentation for Obsidian to NotionNext plugin setup and usage

docs/.vitepress/config.ts

@@ -0,0 +1,69 @@
+import { defineConfig } from 'vitepress'
+import { withSidebar } from 'vitepress-sidebar';
+
+// https://vitepress.dev/reference/site-config
+const vitePressOptions = {
+  title: "Obsidian to NotionNext",
+  description: "A plugin to share files to any Notion database using the Notion API.",
+
+  themeConfig: {
+    socialLinks: [
+      { icon: 'github', link: 'https://github.com/jxpeng98/obsidian-to-NotionNext' }
+    ]
+  },
+  locales: {
+    root: {
+      label: 'English',
+      lang: 'en',
+      link: '/en/',
+      themeConfig: {
+        nav: [
+          { text: 'Home', link: '/en/' },
+          { text: 'Guide', link: '/en/01-getting-started' }
+        ],
+      }
+    },
+    zh: {
+      label: '简体中文',
+      lang: 'zh-CN',
+      link: '/zh/',
+      themeConfig: {
+        nav: [
+          { text: '首页', link: '/zh/' },
+          { text: '指南', link: '/zh/01-getting-started' }
+        ],
+      }
+    }
+  }
+};
+
+
+const commonSidebarOptions = {
+  documentRootPath: '/docs',
+  useTitleFromFrontmatter: true,
+  frontmatterTitleFieldName: 'title',
+  collapsed: true,
+  removePrefixAfterOrdering: true,
+  prefixSeparator: '-',
+  hyphenToSpace: true,
+  useFolderTitleFromIndexFile: true,
+  useFolderLinkFromIndexFile: true,
+  sortMenusByName: false,
+};
+
+const vitePressSidebarOptions = [
+  {
+    ...commonSidebarOptions,
+    scanStartPath: '/en',
+    basePath: '/',
+    resolvePath: '/en/'
+  },
+  {
+    ...commonSidebarOptions,
+    scanStartPath: '/zh',
+    basePath: '/',
+    resolvePath: '/zh/',
+  }
+];
+
+export default defineConfig(withSidebar(vitePressOptions, vitePressSidebarOptions));