feat: add readme.md

Author: sun0225SUN

README.md

@@ -0,0 +1,18 @@
+## 内嵌视频
+
+```html
+<iframe src="https://lusun.com/embed/?id=芦笋视频ID" width="100%" height="500px" scrolling="no" border="0" frameborder="no" framespacing="0" allowfullscreen="true"></iframe>
+```
+
+## 图片居中和描述
+
+```html
+<ImgCenter></ImgCenter>
+<ImgDesc></ImgDesc>
+```
+
+## 链接卡片
+
+```html
+<Link title="芦笋录屏官网——新一代极简视频录制工具" logo="https://lusun.com/logo.png" url="https://lusun.com"></Link>
+```