Add the VitePress documentation scaffold

docs/.gitignore

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+/node_modules/
+.vitepress/dist
+.vitepress/temp
+.vitepress/cache

docs/.vitepress/config.mjs

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+import { defineConfig } from 'vitepress'
+
+// https://vitepress.dev/reference/site-config
+export default defineConfig({
+  title: "Nostr",
+  description: "Ruby gem documentation",
+  themeConfig: {
+    // https://vitepress.dev/reference/default-theme-config
+    nav: [
+      { text: 'Home', link: '/' },
+      { text: 'Examples', link: '/markdown-examples' }
+    ],
+
+    sidebar: [
+      {
+        text: 'Examples',
+        items: [
+          { text: 'Markdown Examples', link: '/markdown-examples' },
+          { text: 'Runtime API Examples', link: '/api-examples' }
+        ]
+      }
+    ],
+
+    socialLinks: [
+      { icon: 'github', link: 'https://github.com/vuejs/vitepress' }
+    ]
+  }
+})

docs/api-examples.md

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+---
+outline: deep
+---
+
+# Runtime API Examples
+
+This page demonstrates usage of some of the runtime APIs provided by VitePress.
+
+The main `useData()` API can be used to access site, theme, and page data for the current page. It works in both `.md` and `.vue` files:
+
+```md
+<script setup>
+import { useData } from 'vitepress'
+
+const { theme, page, frontmatter } = useData()
+</script>
+
+## Results
+
+### Theme Data
+<pre>{{ theme }}</pre>
+
+### Page Data
+<pre>{{ page }}</pre>
+
+### Page Frontmatter
+<pre>{{ frontmatter }}</pre>
+```
+
+<script setup>
+import { useData } from 'vitepress'
+
+const { site, theme, page, frontmatter } = useData()
+</script>
+
+## Results
+
+### Theme Data
+<pre>{{ theme }}</pre>
+
+### Page Data
+<pre>{{ page }}</pre>
+
+### Page Frontmatter
+<pre>{{ frontmatter }}</pre>
+
+## More
+
+Check out the documentation for the [full list of runtime APIs](https://vitepress.dev/reference/runtime-api#usedata).

docs/index.md

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+---
+# https://vitepress.dev/reference/default-theme-home-page
+layout: home
+
+hero:
+  name: "Nostr"
+  text: "Ruby gem documentation"
+  tagline: My great project tagline
+  actions:
+    - theme: brand
+      text: Markdown Examples
+      link: /markdown-examples
+    - theme: alt
+      text: API Examples
+      link: /api-examples
+
+features:
+  - title: Feature A
+    details: Lorem ipsum dolor sit amet, consectetur adipiscing elit
+  - title: Feature B
+    details: Lorem ipsum dolor sit amet, consectetur adipiscing elit
+  - title: Feature C
+    details: Lorem ipsum dolor sit amet, consectetur adipiscing elit
+---
+

docs/markdown-examples.md

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+# Markdown Extension Examples
+
+This page demonstrates some of the built-in markdown extensions provided by VitePress.
+
+## Syntax Highlighting
+
+VitePress provides Syntax Highlighting powered by [Shiki](https://github.com/shikijs/shiki), with additional features like line-highlighting:
+
+**Input**
+
+````
+```js{4}
+export default {
+  data () {
+    return {
+      msg: 'Highlighted!'
+    }
+  }
+}
+```
+````
+
+**Output**
+
+```js{4}
+export default {
+  data () {
+    return {
+      msg: 'Highlighted!'
+    }
+  }
+}
+```
+
+## Custom Containers
+
+**Input**
+
+```md
+::: info
+This is an info box.
+:::
+
+::: tip
+This is a tip.
+:::
+
+::: warning
+This is a warning.
+:::
+
+::: danger
+This is a dangerous warning.
+:::
+
+::: details
+This is a details block.
+:::
+```
+
+**Output**
+
+::: info
+This is an info box.
+:::
+
+::: tip
+This is a tip.
+:::
+
+::: warning
+This is a warning.
+:::
+
+::: danger
+This is a dangerous warning.
+:::
+
+::: details
+This is a details block.
+:::
+
+## More
+
+Check out the documentation for the [full list of markdown extensions](https://vitepress.dev/guide/markdown).

docs/package.json

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+{
+  "scripts": {
+    "docs:dev": "vitepress dev",
+    "docs:build": "vitepress build",
+    "docs:preview": "vitepress preview"
+  },
+  "devDependencies": {
+    "vitepress": "^1.0.0-rc.13"
+  }
+}