Added docs for Nexa codec (#1313)

Co-authored-by: Stefan Grufman <stefan.grufman@gmail.com>
Co-authored-by: Jesse Hills <3060199+jesserockz@users.noreply.github.com>

components/remote_receiver.rst

@@ -36,6 +36,7 @@ Configuration variables:
   - **lg**: Decode and dump LG infrared codes.
   - **midea**: Decode and dump Midea infrared codes.
   - **nec**: Decode and dump NEC infrared codes.
+  - **nexa**: Decode and dump Nexa (RF) codes.
   - **panasonic**: Decode and dump Panasonic infrared codes.
   - **pioneer**: Decode and dump Pioneer infrared codes.
   - **raw**: Print all remote codes in their raw form. Useful for using arbitrary protocols.
@@ -87,6 +88,9 @@ Automations:
       Therefore, if the the configuration file has come from an earlier version of ESPhome, it is necessary to reverse the order of the address and command bits when moving to 2021.12 or above.
       For example, address: 0x84ED, command: 0x13EC becomes 0xB721 and 0x37C8 respectively.
 
+- **on_nexa** (*Optional*, :ref:`Automation <automation>`): An automation to perform when a
+  Nexa RF code has been decoded. A variable ``x`` of type :apiclass:`remote_base::NexaData`
+  is passed to the automation for use in lambdas.
 - **on_panasonic** (*Optional*, :ref:`Automation <automation>`): An automation to perform when a
   Panasonic remote code has been decoded. A variable ``x`` of type :apistruct:`remote_base::PanasonicData`
   is passed to the automation for use in lambdas.
@@ -183,6 +187,14 @@ Remote code selection (exactly one of these has to be included):
   - **address** (**Required**, int): The address to trigger on, see dumper output for more info.
   - **command** (**Required**, int): The NEC command to listen for.
 
+- **nexa**: Trigger on a decoded Nexa RF code with the given data.
+
+  - **device** (**Required**, int): The Nexa device code to trigger on, see dumper output for more info.
+  - **group** (**Required**, int): The Nexa group code to trigger on, see dumper output for more info.
+  - **state** (**Required**, int): The Nexa state code to trigger on, see dumper output for more info.
+  - **channel** (**Required**, int): The Nexa channel code to trigger on, see dumper output for more info.
+  - **level** (**Required**, int): The Nexa level code to trigger on, see dumper output for more info.
+
 - **panasonic**: Trigger on a decoded Panasonic remote code with the given data.
 
   - **address** (**Required**, int): The address to trigger on, see dumper output for more info.

components/remote_transmitter.rst

@@ -196,6 +196,30 @@ Configuration variables:
 - **command** (**Required**, int): The NEC command to send.
 - All other options from :ref:`remote_transmitter-transmit_action`.
 
+``remote_transmitter.transmit_nexa`` Action
+*******************************************
+
+This :ref:`action <config-action>` a Nexa RF remote code to a remote transmitter.
+
+.. code-block:: yaml
+
+    on_...:
+      - remote_transmitter.nexa:
+          device: 0x38DDB4A
+          state: 1
+          group: 0
+          channel: 15
+          level: 0
+
+Configuration variables:
+
+- **device** (**Required**, int): The Nexa device code to send, see dumper output for more info.
+- **state** (**Required**, int): The Nexa state code to send (0-OFF, 1-ON, 2-DIMMER LEVEL), see dumper output for more info.
+- **group** (**Required**, int): The Nexa group code to send, see dumper output for more info.
+- **channel** (**Required**, int): The Nexa channel code to send, see dumper output for more info.
+- **level** (**Required**, int): The Nexa level code to send, see dumper output for more info.
+- All other options from :ref:`remote_transmitter-transmit_action`.
+
 .. _remote_transmitter-transmit_panasonic:
 
 ``remote_transmitter.transmit_panasonic`` Action