Add checkbox ui

auth/src/main/res/layout/fragment_validate_email.xml

@@ -109,6 +109,17 @@
         app:layout_constraintStart_toEndOf="@id/guidelineCenterVertical"
         app:layout_constraintTop_toBottomOf="@id/tilEmail" />
 
+    <com.google.android.material.checkbox.MaterialCheckBox
+        android:id="@+id/cbEmailUpdates"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:layout_marginTop="16dp"
+        android:checked="true"
+        android:text="@string/receive_email_updates"
+        android:textAppearance="@style/body"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@id/btnSendCode" />
 
     <org.futo.circles.core.view.LoadingButton
         android:id="@+id/btnValidate"

auth/src/main/res/values/strings.xml

@@ -153,6 +153,7 @@ Or, think about all of your friends across all of the places you\'ve ever lived.
 <br/><br/>For example, you might want to create a group for your book club, or your sports team, or your scout troop.
 <br/><br/>If you want to share with lots of different people who <i>don\'t</i> all know each other, then you should invite those people to follow you in a <b>Circle</b> instead.]]></string>
     <string name="configure">Configure</string>
+    <string name="receive_email_updates">Receive email updates</string>
 
     <plurals name="days">
         <item quantity="one">%1$d day</item>