Modifies YAML files to work with studio/sample page (#1259)

Author: codingjeremy

.google/packaging.yaml

@@ -9,6 +9,7 @@ categories:   [Getting Started]
 languages:    [Java]
 solutions:    [Mobile, Monetization, Startup, Enterprise]
 github:       firebase/quickstart-android
+branch:       master
 level:        BEGINNER
 icon:         .google/icon.png
 license:      apache2

mlkit/.google/packaging.yaml

@@ -0,0 +1,18 @@
+# GOOGLE SAMPLE PACKAGING DATA
+#
+# This file is used by Google as part of our samples packaging process.
+# End users may safely ignore this file. It has no relevance to other systems.
+---
+status:       PUBLISHED
+technologies: [Android]
+categories:   [Machine Learning]
+languages:    [Java, Kotlin]
+solutions:    [Mobile]
+github:       firebase/quickstart-android
+branch:       master
+level:        INTERMEDIATE
+apiRefs:
+    - gms:com.google.mlkit.vision.common.InputImage
+    - gms:com.google.mlkit.vision.barcode.Barcode
+    - gms:com.google.mlkit.vision.barcode.BarcodeScanner
+license:      apache2