Create ENS161 (#1277)

* Create ENS161

ENS161 air quality sensor, follow up product for iAQcore and CCS811

* Rename ENS161 to ENS161.md

* Update ENS161.md

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Co-authored-by: blakadder <blakadder@users.noreply.github.com>

docs/ENS161.md

@@ -0,0 +1,42 @@
+# ENS161 indoor air quality sensor
+
+??? failure "This feature is not included in precompiled binaries"  
+
+    When [compiling your build](Compile-your-build) add the following to `user_config_override.h`:
+    ```arduino
+    #ifndef USE_ENS16x
+    #define USE_ENS16x         
+    #endif
+    ```
+
+The ENS161 indoor air quality sensor is a low-cost solution for detecting air quality. This module uses MEMS hotplate coated with metal oxide semiconductor (MOx) technology to detect a broad range of VOCs (volotile organic compounds). In addition an CO~2~ equivalent value as well as a relative air quality index is reported. 
+Two versions are available ENS160 and ENS161. ENS161 is the latest release offering in addition a low power option and AQIS output. THe driver is able to work with both options.  
+
+## Configuration
+
+#### Wiring
+
+Follow datasheet for required pull-ups when connecting the bare sensor module directly to ESP8266. Wemos and NodeMCU board include the required pull-up. The component is operated with 3.3V and 1.8V. 
+The sensor component can be operated with two differnet I2C addresses. So in principle the use of two components on the same I2C interface is possible. 
+
+#### Tasmota Settings
+
+In the **_Configuration -> Configure Module_** page assign:
+
+1. GPIOx to `I2C SDA`
+2. GPIOy to `I2C SCL`
+
+After configuring the GPIO's the driver will check both possible I2C addresses and detect connected ENS161 sensors automatically.
+
+## Usage
+
+Typical sensor reading should be around 450 ppm eCO~2~ and 125 ppb TVOC. The AQIS value is in the range of 0 to 500.  
+
+#### Where to get (e.g.)
+
+* [Adafruit](https://www.adafruit.com/product/5606)
+* [Sparkfun](https://www.sparkfun.com/products/22858)
+* [DFRobot](https://www.dfrobot.com/product-2523.html)
+* [DigiKey](https://www.digikey.com/product-detail/en/ams/IAQ-CORE-C/IAQ-COREC-ND/5117221)
+
+[ENS161 Datasheet](https://www.sciosense.com/wp-content/uploads/2023/06/SC-001855-DS-2-ENS161-Datasheet.pdf)