docs: add opencli-plugin-vk to plugins list

Author: Vladimir Alabov

README.md

@@ -278,6 +278,7 @@ opencli plugin uninstall my-tool                            # Remove
 | [opencli-plugin-github-trending](https://github.com/ByteYue/opencli-plugin-github-trending) | YAML | GitHub Trending repositories |
 | [opencli-plugin-hot-digest](https://github.com/ByteYue/opencli-plugin-hot-digest) | TS | Multi-platform trending aggregator |
 | [opencli-plugin-juejin](https://github.com/Astro-Han/opencli-plugin-juejin) | YAML | 稀土掘金 (Juejin) hot articles |
+| [opencli-plugin-vk](https://github.com/flobo3/opencli-plugin-vk) | TS | VK (VKontakte) wall, feed, and search |
 
 See [Plugins Guide](./docs/guide/plugins.md) for creating your own plugin.