How to build PlatformIO based project

1. Install PlatformIO Core
2. Download development platform with examples
3. Extract ZIP archive
4. Run these commands:

# Build project
$ pio run

# Upload firmware
$ pio run --target upload

# Build specific environment
$ pio run -e nucleo_f401re

# Upload firmware for the specific environment
$ pio run -e nucleo_f401re --target upload

# Clean build files
$ pio run --target clean