add espnow example

docs/software/espnow.md

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+---
+template: main.html
+description: ESPNOW Example ESP8266 or ESP32
+title: ESPNOW Example ESP8266 or ESP32
+---
+
+![Software Banner](https://raw.githubusercontent.com/ExpressLRS/ExpressLRS-Hardware/master/img/software.png)
+
+## Description
+
+ExpressLRS now has support for Espnow Backpack. This is a simple example for the ESP8266 and ESP32 to receive data from a Backpack using the CRSF protocol.
+
+## Hardware Requirements
+
+ESP8266 and ESP32 board.
+
+## Example Code
+
+https://github.com/druckgott/ELRS-Backpack-Example-ESPNOW
+
+## Software Requirements
+
+Ensure both your transmitter module and your receiver are up to date with the latest release versions; follow the [Firmware Update Guide](../../quick-start/getting-started/) for detailed instructions.
+
+The minimum version to use this feature is:
+- Receiver firmware: `3.5.0`
+- Backpack firmware: `1.5.0`
+
+## Setting up
+
+1. Install Visual Studio Code and Platform io https://code.visualstudio.com/download
+
+2. Install git.
+
+3. Add project to Visual Studio code and compile and flash.
+
+# Config the sketch:
+ * On the website https://expresslrs.github.io/web-flasher/, the private UID must be generated (using the same password as the ELRS system).
+ * This UID must be entered in the sketch under ``` uint8_t UID[6] = {106,19,19,206,193,30};```.
+
+ * In the ELRS Backpack, Telemetry ESPNOW must be enabled (tested with Backpack version 1.5.1).
+
+ * A telemetry connection between the transmitter and, for example, the drone/flight controller must be established.