doc: add demo video

README.md

@@ -9,6 +9,10 @@ A no-frills web playground plugin for Obsidian.
 <small>(icon credit: [3dicons](https://3dicons.co))</small>
 </div>
 
+## Demo
+
+https://github.com/runofthemillgeek/swarnam-obsidian/assets/2759499/333424b3-2f82-4c1e-9e50-68c837227433
+
 ## Usage
 
 Install the extension from Obsidian community plugins list (you need to enable this first from
@@ -17,39 +21,39 @@ Settings), enable the plugin and then restart Obsidian.
 To create a new Swarnam block, you need to open a block code snippet and give it the `swarnam` tag
 like so:
 
-```swarnam
+    ```swarnam
-<h1>Hello, world</h1>
+    <h1>Hello, world</h1>
-```
+    ```
 
 When you preview this, it'll show the source and render the HTML side-by-side. You can hover on the
 top-right and click the `</>` icon to edit the snippet to make some changes.
 
 You can also add CSS and JS by separating them with `---*---` like so:
 
-```swarnam
+    ```swarnam
-<h1 id="h1">Hello world</h1>
+    <h1 id="h1">Hello world</h1>
 
----*---
+    ---*---
 
-h1 {
+    h1 {
     font-family: "Manjari";
     color: red;
     animation: rainbow 5s ease infinite forwards;
-}
+    }
 
-@keyframes rainbow {
+    @keyframes rainbow {
     0% { filter: hue-rotate(0); }
     100% { filter: hue-rotate(360deg); }
-}
+    }
 
----*---
+    ---*---
 
-let i = 0;
+    let i = 0;
 
-setInterval(() => {	
+    setInterval(() => {	
         h1.textContent = `${["Hello", "Hola", "നമസ്കാരം"][i++ % 3]} Obsidian!`;
-}, 1500)
+    }, 1500)
-```
+    ```
 
 This'll render the three snippets on the left side and show the preview of a web page that has all
 these 3 blocks injected.