[mirotalksfu] - update readme

README.md

@@ -152,7 +152,7 @@ To embed a meeting within `your service or app` using an iframe, you can use the
 
 ```html
 <iframe
-    allow="camera; microphone; display-capture; fullscreen; clipboard-read; clipboard-write; autoplay"
+    allow="camera; microphone; display-capture; fullscreen; clipboard-read; clipboard-write; web-share; autoplay"
     src="https://sfu.mirotalk.com/newroom"
     style="height: 100vh; width: 100vw; border: 0px;"
 ></iframe>