My "drawable" folder is missing XAMARIN

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C#

Android

Xamarin

Hello, i want to put a picture into my Android App. But somehow there isn't a drawable folder where the picture should be given. What can I do? Or is there another possibility to put a picture in?

<ImageButton
       android:src="@android:drawable/ic_menu_gallery"
       android:layout_width="wrap_content"
       android:layout_height="wrap_content"
       android:id="@+id/imageButton1" />

What I have tried:

I looked for this problem in the internet, but couldn't find anything..