Just copy the ESP8266 QRcode folder to your Arduino 'libraries' folder. I have included an example sketch.
The code is based on qrdquino by tz1: https://github.com/anunpanya/ and forked from https://github.com/huangshaun/ESP8266_ILI9341_QRCODE
The QR code just generate version 7 and max string length is 260.
Open Library Manager (menu Sketch > Include Library > Manage Libraries…) then install the following libraries
- TFT_eSPI by Bodmer and Adafruit_GFX
- Open Arduino IDE, try examples of ESP8266 ILI9341 QRcode library