[TW#17249] Simple Wi-Fi examples

[xarrange]

Hi, I believe its worth to add simple wi-fi examples to getting-started.

By "simple" I mean:

1. STA: connect to AP using provided SSID/pass and print ip addr
2. AP: using provided SSID/pass create AP, wait till client connects, print ip addr
   This should be like "hello world" in terms of wi-fi

It's not so comfortable to cut pieces of code from several examples - you'll always have background thought "I missed something"

[copercini]

Take a look on Arduino for ESP32, it's a simplification layer that runs over IDF: https://github.com/espressif/arduino-esp32/blob/master/libraries/WiFi/examples/WiFiClient/WiFiClient.ino
https://github.com/espressif/arduino-esp32/blob/master/docs/esp-idf_component.md

[xarrange]

That's even worse. To use this Arduino example in pure ESP-IDF program I have to change much more things.

[TimXia]

@xarrange Thanks for your kindly suggestion. We will add this example.