Add video

docs/modules/ROOT/pages/features.adoc

@@ -25,6 +25,8 @@ If the content of the page is changed, the rendered view is automatically refres
 
 This means that if you edit the viewed AsciiDoc and save, the rendered view will change.
 
+video::attachment$live-preview.mp4[]
+
 See xref:options.adoc#poll-for-changes[Poll for Changes] on the options page.
 
 [[set-asciidoc-attributes]]
@@ -75,6 +77,9 @@ URL query parameters
 ----
 https://example.com/page.adoc**?toclevels=1&stylesheet=maker**
 ----
+
+video::attachment$live-preview.mp4[]
+
 *Example*
 
 You have a document `ex-query.adoc` that uses two attributes `\{first}` and `\{last}` to say "Hello \{first} \{last}!" in the document title.
@@ -97,7 +102,6 @@ Then, to send a first and last name to the document via the URL, you would add `
 file:///C:/Users/User/Documents/ex-query.adoc**?first=Irma&last=Writer**
 ----
 
-
 You should see the following result:
 
 [indent=0]