Added ST7789 Display

Author: Melissa LeBlanc-Williams

.gitmodules

@@ -457,3 +457,6 @@
 [submodule "libraries/drivers/ssd1331"]
 	path = libraries/drivers/ssd1331
 	url = https://github.com/adafruit/Adafruit_CircuitPython_SSD1331.git
+[submodule "libraries/drivers/st7789"]
+	path = libraries/drivers/st7789
+	url = https://github.com/adafruit/Adafruit_CircuitPython_ST7789.git

docs/drivers.rst

@@ -104,6 +104,7 @@ Drivers used to display information. Either pixel or segment based.
     Sharp Memory Display <https://circuitpython.readthedocs.io/projects/sharpmemorydisplay/en/latest/>
     ST7735 TFT-LCD displays <https://circuitpython.readthedocs.io/projects/st7735/en/latest/>
     ST7735R TFT-LCD displays <https://circuitpython.readthedocs.io/projects/st7735r/en/latest/>
+    ST7789 TFT-LCD displays <https://circuitpython.readthedocs.io/projects/st7789/en/latest/>
 
 Real-time clocks
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