Update rfguru_rp2040.md

Author: ure

_board/rfguru_rp2040.md

@@ -2,7 +2,7 @@
 layout: download
 board_id: "rfguru_rp2040"
 title: "RF.Guru µPico Download"
-name: "RF.Guru µPico"
+name: "µPico"
 manufacturer: "RF.Guru"
 board_url:
  - "https://github.com/Guru-RF/MicroPico"
@@ -13,10 +13,20 @@ features:
 
 ---
 
-This board hasn't been fully documented yet. Please make a pull request adding more info to this file.
+The **µPico Stick** is an affordable and high-performing development board, utilizing the **RP2040 PICO chip** developed by Raspberry Pi. You can also opt for a stylish case for added protection.
 
-The description should be written to inform a CircuitPython user what makes the board unique and link to relevant info about it.
+The **RP2040 microcontroller chip**, often referred to as "Raspberry Silicon," features a dual-core ARM Cortex-M0+ processor clocked at 133 MHz, 256 KB of RAM, 30 GPIO pins, and various interface options. Additionally, it boasts 2 MB of onboard QSPI flash memory for storing both code and data.
 
+**On Board IO**
+
+- 2 push buttons
+- 2 RGB Leds
+- A Piezo buzzer for audio output
+- Pins It exposes RP2040 pins 16 till 24. 2 ADC ports, I2C bus, SPI bus and UART0
+
+## Purchase
+
+* [RF.Guru](https://shop.rf.guru/products/2022-pa-104)
 
 ## Learn More