Add desc scroll

app/src/leanback/res/layout/dialog_desc.xml

@@ -1,10 +1,17 @@
 <?xml version="1.0" encoding="utf-8"?>
-<TextView xmlns:android="http://schemas.android.com/apk/res/android"
-    android:id="@+id/text"
+<androidx.core.widget.NestedScrollView xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="match_parent"
-    android:layout_height="wrap_content"
-    android:letterSpacing="0.05"
-    android:lineSpacingExtra="8dp"
-    android:padding="16dp"
-    android:textColor="@color/grey_800"
-    android:textSize="16sp" />
+    android:layout_height="match_parent"
+    android:fillViewport="true">
+
+    <TextView
+        android:id="@+id/text"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:letterSpacing="0.05"
+        android:lineSpacingExtra="8dp"
+        android:padding="16dp"
+        android:textColor="@color/grey_800"
+        android:textSize="16sp" />
+
+</androidx.core.widget.NestedScrollView>