chore: add android (#80)

Author: Robby Uitbeijerse

pages/service/companion/introduction.mdx

@@ -12,10 +12,15 @@ Through our SDK implementation, we give you the power to generate a secure conne
 
 <Cards>
   <Card
-    icon="✅ "
+    icon="🍎 "
     title="iOS"
     href="https://apps.apple.com/us/app/beam-companion/id6467641736"
   />
+  <Card
+    icon="🤖 "
+    title="Android"
+    href="https://play.google.com/store/apps/details?id=com.onbeam.companion_app"
+  />
 </Cards>
 
 <Callout emoji="🛠️">