Add Arduino-Pico example

examples/arduino-blink-earlephilhower/README.md

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+How to build PlatformIO based project
+=====================================
+
+<<<<<<< HEAD
+1. [Install PlatformIO Core](http://docs.platformio.org/page/core.html)
+=======
+1. [Install PlatformIO Core](https://docs.platformio.org/page/core.html)
+>>>>>>> e08da697f0a750d5ebdd17d299d262b729e67c42
+2. Download [development platform with examples](https://github.com/platformio/platform-raspberrypi/archive/develop.zip)
+3. Extract ZIP archive
+4. Run these commands:
+
+```shell
+# Change directory to example
+$ cd platform-raspberrypi/examples/arduino-blink
+
+# Build project
+$ pio run
+
+# Upload firmware
+$ pio run --target upload
+
+# Clean build files
+$ pio run --target clean
+```