added more description

README.md

@@ -18,3 +18,52 @@ easier due to the well documented code.
 ```shell
 pip install owlapy
 ```
+
+## Usage
+
+```python
+from owlapy.render import DLSyntaxObjectRenderer
+from owlapy.namespaces import Namespaces
+from owlapy.model import IRI, OWLClass, OWLObjectProperty, OWLObjectSomeValuesFrom, \
+                         OWLObjectIntersectionOf
+
+# defining the ontology namespace with prefix 'ex'
+NS = Namespaces("ex", "http://example.com/society#")
+
+# create the iri referring to 'male' class
+male_iri = IRI.create(NS,'male')
+
+# create the male class
+male = OWLClass(male_iri)
+
+# create an object property
+hasChild = OWLObjectProperty(IRI.create(NS,'hasChild'))
+
+# create an existential restrictions
+males_with_children = OWLObjectSomeValuesFrom(hasChild, male)
+
+#let's make it more complex by intersecting with another class
+teacher = OWLClass(IRI.create(NS ,'teacher'))
+male_teachers_with_children = OWLObjectIntersectionOf([males_with_children, teacher])
+
+# This can be printed in description logics
+print(DLSyntaxObjectRenderer().render(male_teachers_with_children))
+```
+The following will be printed:
+
+```commandline
+(∃ hasChild.male) ⊓ teacher
+```
+
+Like we showed in this example, you can create more complex class expressions, and there 
+are a lot of other OWL objects in owlapy model that you can use.
+
+### Are you looking for more?
+
+The java _owlapi_ library also offers classes for OWL ontology, manager and reasoner. 
+We have also implemented those classes in python, but for the time being we are 
+not including them in owlapy. You can find all of those classes in
+[Ontolearn](https://github.com/dice-group/Ontolearn/tree/develop), which is a 
+python library that offers more than just that.
+
+In case you have any question or request please don't hesitate to open an issue.