This is an user defined driver for Sonoff-Tasmota to support the cheap I2C temperature/humidity sensor AM2320.
Just drop the driver file into the sonoff subdirectory of your copy of Tasmota, add a #define USE_AM2320 preprocessor statement to your my_user_config.h right below the #ifdef USE_I2C statement around line 290. Recompile Tasmota, flash your device and configure two GPIOs (SDA/SCL) for I2C use the Tasmota WebUI. If you use the TX/RX pins on your Tasmota device (not recommended) make sure you have serial logging disabled (enter SerialLog off in Tasmota console). Tested with Tasmota 6.4.1.
When you connect the AM2320 sensor to the SDA/SCL pins of your Tasmota device make sure to include 4.7k pull-up resistors from VCC to SDA and from VCC to SDL or I2C communication might not work as expected. If you've already connected another I2C device on a breakout board to the I2C bus you can probably skip the pull-up resistors since these are usually provided on a sensor breakout board.