Added description to README.

README.md

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 # SX1278
 STM32 HAL driver for LoRa SX1278 module
+
+This is a driver for wireless LoRa module -- SX1278.
+
+The initial work was based on DORJI.COM sample code and [SX1278_LoRa](https://github.com/realspinner/SX1278_LoRa).
+
+# About the driver
+
+The driver was written in **C**. It has a hardware abstraction layer for easy porting to others MCUs.
+Also the hardware functions are defined as *__weak* so there is no need to change the driver files themselves.
+The driver is using HAL to communicate between STM32 SPI periperal and LoRa module.
+
+# Example
+
+There is also an example available at [SX1278-example repository](https://github.com/wdomski/SX1278-example). 
+The example project was prepared for STM32F1 MCU in SW4STM32.
+
+# Final remarks
+
+You can visit [my blog](http://blog.domski.pl) to read more about the SX1278 modules or my other projects.
+