feat: add readme

README.md

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+# Neopixel driver for AVR mcu
+
+## Motivation
+
+For AVR exist two library:
+- With using extremely unstable features: https://github.com/devcexx/ws2812-avr
+- With using only SPI: https://github.com/smart-leds-rs/ws2812-spi-rs
+
+I'm focused on SmartLed trait implementation for AVR MCU (reference: https://github.com/devcexx/ws2812-avr).