Adds one central import form.

Android/app/src/main/res/layout/dialog_import.xml

@@ -0,0 +1,43 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    android:orientation="vertical"
+    android:padding="24dp">
+
+    <TextView
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:text="@string/dialog_import_message"
+        android:paddingBottom="8dp" />
+
+    <EditText
+        android:id="@+id/edit_text_url"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:hint="@string/dialog_import_url_hint"
+        android:inputType="textUri"
+        android:importantForAutofill="no"
+        android:singleLine="true" />
+
+    <Button
+        android:id="@+id/button_import_url"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_marginTop="8dp"
+        android:text="@string/action_import_from_url" />
+
+    <View
+        android:layout_width="match_parent"
+        android:layout_height="1dp"
+        android:layout_marginTop="16dp"
+        android:layout_marginBottom="16dp"
+        android:background="?android:attr/listDivider" />
+
+    <Button
+        android:id="@+id/button_import_file"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:text="@string/action_import_monster_from_file" />
+
+</LinearLayout>