updates Readme explaining how to use units with number sliders

README.md

@@ -409,7 +409,47 @@ In this example, `MySlider` overrides the `min`, `max`, `step_size`, and `value`
      service_instance = MyService()
      my_service.voltage.value = 7  # Output: "Voltage changed to: 7"
      pydase.Server(service_instance).run()
-  ````
+  ```
+
+- Incorporating units in `NumberSlider`
+
+  The `NumberSlider` is capable of displaying units alongside values, enhancing its usability in contexts where unit representation is crucial. When utilizing `pydase.units`, you can specify units for the slider's value, allowing the component to reflect these units in the frontend.
+
+  Here's how to implement a `NumberSlider` with unit display:
+
+  ```python
+  import pydase
+  import pydase.components
+  import pydase.units as u
+
+  class MySlider(pydase.components.NumberSlider):
+      def __init__(
+          self,
+          value: u.Quantity = 0.0 * u.units.V,
+      ) -> None:
+          super().__init__(value)
+
+      @property
+      def value(self) -> u.Quantity:
+          return self._value
+
+      @value.setter
+      def value(self, value: u.Quantity) -> None:
+          if value.m < self._min or value.m > self._max:
+              raise ValueError("Value is either below allowed min or above max value.")
+          self._value = value
+
+  class MyService(pydase.DataService):
+      def __init__(self) -> None:
+          super().__init__()
+          self.voltage = MySlider()
+
+  if __name__ == "__main__":
+      service_instance = MyService()
+      service_instance.voltage.value = 5 * u.units.V
+      print(service_instance.voltage.value)  # Output: 5 V
+      pydase.Server(service_instance).run()
+  ```
 
 #### `ColouredEnum`