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

docs/index.md

@@ -0,0 +1,29 @@
+---
+# https://vitepress.dev/reference/default-theme-home-page
+layout: home
+
+hero:
+  name: "Obsidian to NotionNext"
+  text: "Share files to any Notion database using the Notion API"
+  tagline: Support All Notion databases, including NotionNext and General Notion databases, and customise the database list.
+  actions:
+    - theme: brand
+      text: Get Started
+      link: /en/
+    - theme: brand
+      text: 现在开始
+      link: /zh/
+    - theme: alt
+      text: View on GitHub
+      link: https://github.com/jxpeng98/obsidian-to-NotionNext
+
+features:
+  - title: All Notion Databases
+    details: Support for both general and NotionNext-specific databases.
+  - title: Custom Properties
+    details: Customize database properties to fit your workflow.
+  - title: Long Note Sync
+    details: Sync long notes seamlessly.
+  - title: Callout Support
+    details: Obsidian callouts are converted to Notion callout blocks.
+---