サブメニュー用のコンテナを作成

feature/debug/src/main/res/layout/fragment_debug_menu_document_tester_top.xml

@@ -7,4 +7,15 @@
     android:theme="@style/Theme.Lacerta"
     tools:context=".DebugMenuDocumentTesterTopFragment">
 
+    <com.google.android.material.appbar.MaterialToolbar
+        android:id="@+id/debug_menu_doc_tester_top_toolbar"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:background="?attr/colorPrimary"
+        android:minHeight="?attr/actionBarSize"
+        android:theme="?attr/actionBarTheme"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent" />
+
 </androidx.constraintlayout.widget.ConstraintLayout>

feature/debug/src/main/res/layout/fragment_debug_menu_sub_container.xml

@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="utf-8"?>
+<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    tools:context=".DebugMenuSubContainerFragment">
+
+    <!-- TODO: Update blank fragment layout -->
+    <TextView
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:text="@string/hello_blank_fragment" />
+
+</FrameLayout>