esptool: add page (#9276)

pages/common/esptool.py.md

@@ -0,0 +1,12 @@
+# esptool.py
+
+> Bootloader utility for Espressif chips (e.g. ESP8266).
+> More information: <https://docs.espressif.com/projects/esptool/en/latest/esp32/>.
+
+- Flash a firmware file to an ESP chip with a given port and baud rate:
+
+`sudo esptool.py --port {{port}} --baud {{baud_rate}} write_flash 0x0 {{path/to/firmware.bin}}`
+
+- Clear the flash of an ESP chip:
+
+`sudo esptool.py --port {{port}} --baud {{baud_rate}} erase_flash`