added new usermod adc_sensor_mqtt_v2 with hass integration

usermods/adc_sensor_mqtt/README.md

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+# ADC sensor with MQTT & HASS support ## 
+This usermod will obtain readings from adc pin. This is useful for ldr for example for exterior lighting situations where you want the lights to only be on when it is dark out. but this mod is designed for more hass application. it will publish auto discovery message to hass mqtt and attach the sensor to the wled integration automatically
+
+# Installation
+Add "adc_sensor_mqtt" to your platformio.ini environment's custom_usermods and build.
+Example:
+```
+[env:adc_sensor_mqtt_esp32dev]
+extends = env:esp32dev
+custom_usermods = ${env:esp32dev.custom_usermods} 
+  adc_sensor_mqtt   # Enable  ADC sensor with MQTT
+```
+
+# Usermod Settings
+Setting | Description | Default
+--- | --- | ---
+Enabled | Enable/Disable the LDR functionality. | Disabled
+Pin | The analog capable pin your LDR is connected to. | A0 is forced in esp8266 and its not optional
+AdcUpdateInterval | update interval to read the analog pin ( in ms ) | 3000
+Inverted | invert readings based on your own hardware setup ( invert mapping analog to digital value to  0V = 100%  or 3.3V = 100% ) | false
+ChangeThreshold | the minimum limit to detect change and publish the value ; checks the raw value ( int ;  5 ) . | 1
+HASS | Enable home assistant mqtt discovery message with wled integration | true 
+Raw | publish the ADC value as raw measurement (0-4096 for ESP32 / 0-1024 for ESP8266) | false
+DeviceClass | HASS sensor discovery device class | voltage 
+UnitOfMeas | HASS sensor discovery device unit of measurements | V  
+
+## Author
+[@rommo911] (https://github.com/rommo911)