Add uses-feature android.software.xr.api.spatial

Author: devbridie

app/src/main/AndroidManifest.xml

@@ -23,6 +23,9 @@
         android:name="android.hardware.camera"
         android:required="true" />
 
+    <!-- Androidify can use XR features if they're available; they're not required. -->
+    <uses-feature android:name="android.software.xr.api.spatial" android:required="false" />
+
     <uses-permission android:name="android.permission.CAMERA" />
     <uses-sdk tools:overrideLibrary="com.google.ai.edge.aicore" />