Create README.md

Author: SuGlider

libraries/WiFi/examples/WiFiScanAsync/README.md

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+# WiFiScanAsync Example
+
+This example demonstrates how to use the WiFi library to scan available WiFi networks in asynchronous mode and print the results.
+
+## Supported Targets
+
+Currently this example supports the following targets.
+
+| Supported Targets | ESP32 | ESP32-S2 | ESP32-C3 | ESP32-S3 | ESP32-C6 |
+| ----------------- | ----- | -------- | -------- | -------- | -------- |
+
+## How to Use Example
+
+* How to install the Arduino IDE: [Install Arduino IDE](https://github.com/espressif/arduino-esp32/tree/master/docs/arduino-ide).
+
+#### Using Arduino IDE
+
+* Before Compile/Verify, select the correct board: `Tools -> Board`.
+* Select the COM port: `Tools -> Port: xxx` where the `xxx` is the detected COM port.
+
+#### Using Platform IO
+
+* Select the COM port: `Devices` or setting the `upload_port` option on the `platformio.ini` file.
+
+## Example/Log Output
+
+```
+Setup done
+Scan start
+Loop running...
+Loop running...
+Loop running...
+Loop running...
+Loop running...
+Loop running...
+Loop running...
+Loop running...
+Loop running...
+
+Scan done
+17 networks found
+Nr | SSID            | RSSI | CH | Encryption
+ 1 | IoTNetwork      |  -62 |  1 | WPA2
+ 2 | WiFiSSID        |  -62 |  1 | WPA2-EAP
+ 3 | B3A7992         |  -63 |  6 | WPA+WPA2
+ 4 | WiFi            |  -63 |  6 | WPA3
+ 5 | IoTNetwork2     |  -64 | 11 | WPA2+WPA3
+...
+```
+
+## Troubleshooting
+
+***Important: Be sure you're using a good quality USB cable and you have enought power source for your project.***
+
+* **Programming Fail:** If the programming/flash procedure fails, try to reduce the serial connection speed.
+* **COM port not detected:** Check the USB cable connection and the USB to Serial driver installation.
+
+If the error persist, you can ask help at the official [ESP32 forum](https://esp32.com) or see [Contribute](#contribute).
+
+## Contribute
+
+To know how to contribute to this project, see [How to contribute.](https://github.com/espressif/arduino-esp32/blob/master/CONTRIBUTING.rst)
+
+If you have any **feedback** or **issue** to report on this example/library, please open an issue or fix it by creating a new PR. Contributions are more than welcome!
+
+Before creating a new issue, be sure to try the Troubleshooting and to check if the same issue was already created by someone else.
+
+## Resources
+
+* Arduino-ESP32 Official Repository: [espressif/arduino-esp32](https://github.com/espressif/arduino-esp32)
+* ESP32 Datasheet: [Link to datasheet](https://www.espressif.com/sites/default/files/documentation/esp32_datasheet_en.pdf)
+* ESP32-S2 Datasheet: [Link to datasheet](https://www.espressif.com/sites/default/files/documentation/esp32-s2_datasheet_en.pdf)
+* ESP32-C3 Datasheet: [Link to datasheet](https://www.espressif.com/sites/default/files/documentation/esp32-c3_datasheet_en.pdf)
+* ESP32-C6 Datasheet: [Link to datasheet](https://www.espressif.com/sites/default/files/documentation/esp32-c6_datasheet_en.pdf)
+* Official ESP-IDF documentation: [ESP-IDF](https://idf.espressif.com)