docs: add all class types to user guide (#2042)

Co-authored-by: Balduin Landolt <[email protected]>
Co-authored-by: domsteinbach <[email protected]>

docs/user-guide/project.md

@@ -133,7 +133,17 @@ You can then create a resource class by clicking the button `+ Create new class`
 By clicking `+ Create new class`, a small window pops up with six basic types to choose from:
 ![Choose the type of your resource class.](../assets/images/Fig7.png)
 
-Which type you choose depends on the data type which you need to describe. Let's assume you have pdf-documents of books and they have a number of pages. To describe this in an ontology, you create a class as `Document` by clicking on `Document`. A dialog box pops up which looks like this:
+Which type you choose depends on the data type which you need to describe. You can choose from a selection of the following class types:
+
+- Object without representation
+- Still Image (jp2, jpg, jpeg, png, tif, tiff)
+- Moving Image (mp4)
+- Audio (mp3, wav)
+- Text (csv, json, odd, rng, txt, xml, xsd, xsl)
+- Document (doc, docx, pdf, ppt, pptx, xls, xlsx)
+- Archive (7z, gz, gzip, tar, tgz, z, zip)
+
+Let's assume you have pdf-documents of books and they have a number of pages. To describe this in an ontology, you create a class as `Document` by clicking on `Document`. A dialog box pops up which looks like this:
 ![Create a class with type *Document*.](../assets/images/Fig8.png)
 
 For the label you could write *Book*, and you should add a preferably meaningful comment in at least one of the predefined languages English (en), German (de), French (fr) or Italian (it). Then click the `Submit` button: