add meta for thumbnails

index.html

@@ -12,6 +12,13 @@
       href="https://emojipedia-us.s3.dualstack.us-west-1.amazonaws.com/thumbs/120/apple/271/mount-fuji_1f5fb.png"
     />
 
+    <meta property="og:type" content="website"/>
+    <meta property="og:image" content="https://raw.githubusercontent.com/vibertthio/karesansui/master/static/kare_512x512.jpg"/>
+    <meta property="og:title" content="Interactive Zen Garden in WebXR" />
+    <meta property="og:description" content="This is an interactive Zen Garden in WebXR. The central idea of this small side projects is that Vibert wanted to create a space where you can meditate in the browser. He is strongly impressed by the Zen Gardens when he visited the ancient city Kyoto."/>
+    <meta property="og:url" content="https://vibertthio.com/karesansui/" />
+    <meta property="og:site_name" content="Vibert Thio" />
+
 		<!-- ga -->
     <script>
       (function (i, s, o, g, r, a, m) {