AQI calculator for HM3301 (#535)

* AQI calculator for HM3301

* Update components/sensor/hm3301.rst

Co-authored-by: Guillermo Ruffino <glm.net@gmail.com>

* Update hm3301.rst

* pm1.0 not required

* format to look consistent with dht11

Co-authored-by: Guillermo Ruffino <glm.net@gmail.com>

components/sensor/hm3301.rst

@@ -24,16 +24,59 @@ The sensor communicate with board by ``I2C`` protocol, and requires 3.3v.
           name: "PM2.5"
         pm_10_0:
           name: "PM10.0"
+        aqi:
+          name: "AQI"
+          type: "CAQI"
 
 Configuration variables:
 ------------------------
 
 - **pm_1_0** (*Optional*): Use the concentration of particulates of size less than 1.0µm in µg per cubic meter.
-  All options from :ref:`Sensor <config-sensor>`.
+
+  - **name** (**Required**, string): The name for the temperature sensor.
+  - **id** (*Optional*, :ref:`config-id`): Set the ID of this sensor for use in lambdas.
+  - All other options from :ref:`Sensor <config-sensor>`.
+
 - **pm_2_5** (*Optional*): Use the concentration of particulates of size less than 2.5µm in µg per cubic meter.
-  All options from :ref:`Sensor <config-sensor>`.
+
+  - **name** (**Required**, string): The name for the temperature sensor.
+  - **id** (*Optional*, :ref:`config-id`): Set the ID of this sensor for use in lambdas.
+  - All other options from :ref:`Sensor <config-sensor>`.
+
 - **pm_10_0** (*Optional*): Use the concentration of particulates of size less than 10.0µm in µg per cubic meter.
-  All options from :ref:`Sensor <config-sensor>`.
+
+  - **name** (**Required**, string): The name for the temperature sensor.
+  - **id** (*Optional*, :ref:`config-id`): Set the ID of this sensor for use in lambdas.
+  - All other options from :ref:`Sensor <config-sensor>`.
+
+- **aqi** (*Optional*): AQI sensor. Requires the ``pm_2_5`` and ``pm_10_0`` sensors defined. See below.
+
+  - **type** (**Required**): One of: ``AQI`` or ``CAQI``.
+  - **name** (**Required**, string): The name for the temperature sensor.
+  - **id** (*Optional*, :ref:`config-id`): Set the ID of this sensor for use in lambdas.
+  - All other options from :ref:`Sensor <config-sensor>`.
+
+Air Quality Sensor:
+-------------------
+
+There is a sensor which calculates quality of air based on PM 2.5 and PM 10.0 values.
+There are two implementations:
+
+- AQI: USA air quality standard
+- CAQI: Europe air quality standard
+
+.. code-block:: yaml
+
+    sensor:
+      - platform: hm3301
+        pm_2_5:
+          name: "PM2.5"
+        pm_10_0:
+          name: "PM10.0"
+        aqi:
+          name: "AQI"
+          type: "CAQI"
+
 
 See Also
 --------