Readme update.

Author: espzav

README.md

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+# ESP32-NESEMU, a Nintendo Entertainment System emulator for the ESP32 (IDF v5)
+====================================================================
+
+This is a quick and dirty port of Nofrendo, a Nintendo Entertainment System emulator. It lacks sound, but can emulate a NES at close to full speed, albeit with some framedrop due to the way the display is driven. 
+
+The portation of NES emulator is based on [ESP-BSP](https://github.com/espressif/esp-bsp) code and it allows to change the board quickly. 
+
+|  Selection of the game  | Super Mario | Donkey Kong | qBert |
+| :----------: | :-----------: | :----------: | :----------: |
+| <img src="doc/images/game_selection.jpg"> | <img src="doc/images/game_mario.jpg"> | <img src="doc/images/game_kong.jpg"> | <img src="doc/images/game_qbert.jpg"> |
+
+## Warning
+-------
+
+This is a proof-of-concept (only for demo) and not an official application note. As such, this code is entirely unsupported by Espressif.
+
+## USB HID Controller
+---------
+
+The games are controlled by USB HID SNES GamePad. 
+
+<img src="doc/images/controller.jpg">
+
+## Build and flash
+---------
+
+```
+idf.py -p COMx flash monitor
+```
+
+## Board selection
+---------
+
+For change the board, please edit the [`components/esp_nes/idf_component.yml`](components/esp_nes/idf_component.yml) file and change these lines to another BSP component:
+
+```
+ws_7inch:
+    version: "bsp/7inch_update"
+    path: "SquareLine/boards/custom_waveshare_7inch/components/ws_7inch/"
+    git: https://github.com/espressif/esp-bsp.git
+```
+
+For example, you can use this for ESP-BOX:
+
+```
+esp-box: "*"
+```
+
+## ROM
+---
+This NES emulator does not come with a ROM. This demo allows to select between three games, each game must be flashed to right flash region:
+
+1. Game: `0x00100000`
+2. Game: `0x00200000`
+3. Game: `0x00300000`
+
+You can use this command for flash the game into right flash region:
+
+```
+python esptool.py --chip esp32s3 --port "COM3" --baud $((230400*4)) write_flash -fs 4MB 0x100000 .\games\supermario.nes
+```
+
+## Copyright
+---------
+
+Code in this repository is Copyright (C) 2016 Espressif Systems, licensed under the Apache License 2.0 as described in the file LICENSE. Code in the
+components/nofrendo is Copyright (c) 1998-2000 Matthew Conte (matt@conte.com) and licensed under the GPLv2.
+