added a ShoppinglistListsFragment for listing shop-specific shopping lists

added a ClickListener to provide the behavior to navigate to the ShoppinglistListsFragment
modified necessary files to implement the new behavior

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

@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout
+    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=".ui.dashboard.tabfragment.shoppinglist.ShoppinglistListsFragment">
+
+</androidx.constraintlayout.widget.ConstraintLayout>

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

@@ -1,11 +1,13 @@
 <?xml version="1.0" encoding="utf-8"?>
-<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<androidx.constraintlayout.widget.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="wrap_content">
 
     <androidx.cardview.widget.CardView
+        android:id="@+id/cardview"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:layout_marginStart="15dp"

app/src/main/res/navigation/mobile_navigation.xml

@@ -9,7 +9,11 @@
         android:id="@+id/nav_dashboard"
         android:name="de.chrissthecoder.store.ui.dashboard.DashboardFragment"
         android:label="@string/menu_dashboard"
-        tools:layout="@layout/fragment_dashboard" />
+        tools:layout="@layout/fragment_dashboard" >
+        <action
+            android:id="@+id/action_nav_dashboard_to_shoppinglistLists"
+            app:destination="@id/shoppinglistLists" />
+    </fragment>
 
     <fragment
         android:id="@+id/nav_gallery"
@@ -22,4 +26,10 @@
         android:name="de.chrissthecoder.store.ui.slideshow.SlideshowFragment"
         android:label="@string/menu_slideshow"
         tools:layout="@layout/fragment_slideshow" />
+
+    <fragment
+        android:id="@+id/shoppinglistLists"
+        android:name="de.chrissthecoder.store.ui.dashboard.tabfragment.shoppinglist.ShoppinglistListsFragment"
+        android:label="@string/nav_shoppinglist"
+        tools:layout="@layout/fragment_shoppinglist_lists" />
 </navigation>

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

@@ -13,4 +13,6 @@
 
     <string name="tab_shoppinglist">Einkaufszettel</string>
     <string name="tab_understock">Minderbestand</string>
+
+    <string name="nav_shoppinglist">Einkaufszettel</string>
 </resources>