feat: add doc on how to use admonitions

README.md

@@ -201,6 +201,14 @@ If you need to add internal anchor links from your article to other article of o
 
 > Warning: Don't add html in your markdown, you don't have to override the blog template in the markdown.
 
+This blog supports admonitions classes `warning` ; `info` ; `tip` and `note`
+to generate colored panels
+
+```md
+<div class="admonition warning" markdown="1"><p class="admonition-title">Warning Title</p>
+Warning text block</div>
+```
+
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