added fan doc (#229)

* added fan doc

* Fix methods formatting

* Formatting

docs/entity_fan.md

@@ -3,7 +3,7 @@ title: Fan Entity
 sidebar_label: Fan
 ---
 
-> This entry is incomplete. Contribution welcome.
+A fan entity is a device that controls the different vetors of your fan susch as speed, direction and oscillation. Derive enitity platforms from ['homeassistant.components.fan.FanDevice'](https://github.com/home-assistant/home-assistant/blob/dev/homeassistant/components/fan/__init__.py).
 
 ## Properties
 
@@ -11,6 +11,86 @@ sidebar_label: Fan
 
 | Name | Type | Default | Description
 | ---- | ---- | ------- | -----------
+| current_direction | str | None | Return the current direction of the fan |
+|is_on| boolean | None |Return true if the entity is on |
+| speed | str | None | Return the current speed | 
+| speed_list | list | None| Get the list of available speeds |
+| state_attributes | dict | None | Return optional state attributes |
+| supported_features | int | None | Flag supported features |
+
+
+## Supported Features
+
+| Constant | Description |
+|----------|--------------------------------------|
+| 'SUPPORT_DIRECTION' | The fan supports changing the direction of it.
+| 'SUPPORT_SET_SPEED' | The fan supports setting the speed.
+| 'SUPPORT_OSCILLATE' | The fan supports oscillation.
+
+
 
 ## Methods
 
+### Set direction
+
+Only implement this method if the flag `SUPPORT_DIRECTION` is set.
+
+```python
+class FanEntity(ToggleEntity):
+    # Implement one of these methods.
+
+    def set_direction(self, direction: str) -> None:
+        """Set the direction of the fan."""
+
+    async def async_set_direction(self, direction: str):
+        """Set the direction of the fan."""
+```
+
+### Set speed
+
+Only implement this method if the flag `SUPPORT_SET_SPEED` is set.
+
+```python
+class FanEntity(ToggleEntity):
+    # Implement one of these methods.
+
+ 	 def set_speed(self, speed: str) -> None:
+        """Set the speed of the fan."""
+
+     async def async_set_speed(self, speed: str):
+        """Set the speed of the fan."""
+```
+
+### Turn on
+
+```python
+class FanEntity(ToggleEntity):
+    # Implement one of these methods.
+
+    def turn_on(self, speed: str = None, **kwargs) -> None:
+        """Turn on the fan."""
+
+    async def async_turn_on(self, speed: str = None, **kwargs):
+        """Turn on the fan."""
+```
+
+### Oscillate
+
+Only implement this method if the flag `SUPPORT_OSCILLATE` is set.
+
+```python
+class FanEntity(ToggleEntity):
+    # Implement one of these methods.
+
+    def oscillate(self, oscillating: bool) -> None:
+        """Oscillate the fan."""
+
+    def async_oscillate(self, oscillating: bool):
+        """Oscillate the fan."""
+```
+
+
+
+
+
+