add demos to readme

Author: jh-488

README.md

@@ -26,6 +26,8 @@ Download and install the desktop application for your operating system directly
 page. It provides the same web UI without needing to install Node.js or run any
 commands — just download, install, and open.
 
+<video src="./media/desktop-app.webm" controls width="600"></video>
+
 ### 2. Web UI (via CLI)
 
 Install Node.js first (it includes `npm`):
@@ -52,6 +54,8 @@ Then start the local web server:
 $ liaex serve
 ```
 
+<video src="./media/cli_ui.webm" controls width="600"></video>
+
 This starts the LiaScript Export Server on port 3000 (default). You can specify a different port:
 
 ``` bash
@@ -88,6 +92,8 @@ Once installed, use `liaex` or `liascript-exporter`. Core options:
 Format-specific options are documented in the sections below. You can also run
 `liaex --help` at any time to see the full list.
 
+<video src="./media/cli_cmd.webm" controls width="600"></video>
+
 ### Docker (Android export)
 
 Android exports require the Android SDK, which can be complex to set up locally.
@@ -114,6 +120,18 @@ this repository:
 docker build -t liascript/exporter .
 ```
 
+<video src="./media/docker_cli.webm" controls width="600"></video>
+
+You can also use the Docker container to run the web UI:
+
+``` bash
+docker run --rm -p 4000:4000 liascript/exporter
+```
+
+Then open <http://localhost:4000> in your browser to access the export UI.
+
+<video src="./media/docker_ui.webm" controls width="600"></video>
+
 ## Format Reference
 
 ### SCORM1.2