Update README.md with pinout link for app catalog

docs/README.md

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 ## ESP Flasher app for Flipper Zero
 
-Flipper Zero app to flash ESP chips from the device (no computer connection needed!). Requires an ESP chip connected to the flipper's UART pins (e.g. Wi-Fi devboard).
+Flipper Zero app to flash ESP chips from the device (no computer connection needed!). Requires an ESP chip connected to the flipper's UART pins (e.g. Wi-Fi devboard). For information on how to connect, see the ESP pinout/wiring details on UberGuidoZ's GPIO section: https://github.com/UberGuidoZ/Flipper/tree/main/GPIO
+
+Supported targets: ESP32
+ESP8266
+ESP32-S2
+ESP32-S3
+ESP32-C3
+ESP32-C2
+ESP32-H2
 
 ## Support