Initial support for RP2040

README.md

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+# Raspberry Pi RP2040: development platform for [PlatformIO](https://platformio.org)
+
+[![Build Status](https://github.com/platformio/platform-raspberrypi/workflows/Examples/badge.svg)](https://github.com/platformio/platform-raspberrypi/actions)
+
+RP2040 is a low-cost, high-performance microcontroller device with with a large on-chip memory, symmetric dual-core processor complex, deterministic bus fabric, and rich peripheral set augmented with a unique Programmable I/O (PIO) subsystem, it provides professional users with unrivalled power and flexibility.
+
+* [Home](http://platformio.org/platforms/raspberrypi) (home page in PlatformIO Platform Registry)
+* [Documentation](http://docs.platformio.org/page/platforms/raspberrypi.html) (advanced usage, packages, boards, frameworks, etc.)
+
+# Usage
+
+1. [Install PlatformIO](http://platformio.org)
+2. Create PlatformIO project and configure a platform option in [platformio.ini](http://docs.platformio.org/page/projectconf.html) file:
+
+## Stable version
+
+```ini
+[env:stable]
+platform = raspberrypi
+board = ...
+...
+```
+
+## Development version
+
+```ini
+[env:development]
+platform = https://github.com/platformio/platform-raspberrypi.git
+board = ...
+...
+```
+
+# Configuration
+
+Please navigate to [documentation](http://docs.platformio.org/page/platforms/raspberrypi.html).