Add empty view for empty groups

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout

    xmlns:android="http://schemas.android.com/apk/res/android"

    android:id="@+id/empty_group"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:orientation="vertical"

    android:background="@color/empty_state_background"

    android:visibility="gone">

    <ImageView

        android:id="@+id/empty_group_image"

        android:layout_width="@dimen/empty_group_view_image_width"

        android:layout_height="wrap_content"

        android:scaleType="centerInside"

        android:adjustViewBounds="true"

        android:src="@drawable/label_empty"/>

    <TextView

        android:id="@+id/empty_group_view_text"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_gravity="center_horizontal"

        android:paddingTop="@dimen/empty_group_view_text_padding_top"

        android:paddingBottom="@dimen/empty_group_view_text_padding_bottom"

        android:text="@string/emptyGroup"

        style="@style/EmptyStateTextStyle"/>

    <Button

        android:id="@+id/add_member_button"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_gravity="center_horizontal"

        android:text="@string/menu_addContactsToGroup"

        style="@style/AddContactsButtonStyle"/>

</LinearLayout>

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