Add croutou ticker layout

app/src/main/res/layout/crouton_status_ticker.xml

+<?xml version="1.0" encoding="utf-8"?>
+<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:background="#030000">
+
+    <TextView
+        android:id="@+id/text_view_status"
+        android:layout_width="wrap_content"
+        android:layout_height="32dp"
+        android:background="@color/connection_crouton_background"
+        android:gravity="center"
+        android:text="@string/server_config_activity_authenticating"
+        android:textAlignment="center"
+        android:textColor="@android:color/white"
+        android:textSize="16sp"
+        android:textStyle="bold"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent"
+        tools:text="Authenticating…" />
+
+    <ImageView
+        android:id="@+id/try_again_image"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_marginLeft="8dp"
+        android:layout_marginStart="8dp"
+        app:layout_constraintBottom_toBottomOf="@+id/text_view_status"
+        app:layout_constraintStart_toEndOf="@+id/text_view_status"
+        app:layout_constraintTop_toTopOf="@+id/text_view_status"
+        tools:src="@drawable/ic_loading" />
+</android.support.constraint.ConstraintLayout>
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