Add Velbus cover opening/closing (#79851)

* Velbus cover/blind: indicate opening/closing

* Add docstrings because flake8 requirement

Co-authored-by: Niels Laukens <niels@dest-unreach.be>

homeassistant/components/velbus/cover.py

@@ -38,7 +38,7 @@ class VelbusCover(VelbusEntity, CoverEntity):
     _channel: VelbusBlind
 
     def __init__(self, channel: VelbusBlind) -> None:
-        """Initialize the dimmer."""
+        """Initialize the cover."""
         super().__init__(channel)
         if self._channel.support_position():
             self._attr_supported_features = (
@@ -59,6 +59,16 @@ class VelbusCover(VelbusEntity, CoverEntity):
         """Return if the cover is closed."""
         return self._channel.is_closed()
 
+    @property
+    def is_opening(self) -> bool:
+        """Return if the cover is opening."""
+        return self._channel.is_opening()
+
+    @property
+    def is_closing(self) -> bool:
+        """Return if the cover is closing."""
+        return self._channel.is_closing()
+
     @property
     def current_cover_position(self) -> int | None:
         """Return current position of cover.