Readme with documentation link updated
# ESP8266 and ESP32 AT commands parser for RTOS systems
-More info coming soon..
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+Documentation is under development and is available on link below.
+
+http://majerle.eu/documentation/esp_at/html/index.html
+
+## Why this library?
+
+Purpose of the library is to have stable and reliable communication between
+host MCU (or any other device) and ESP8266/ESP32 using AT commands.
+Library uses advanced techniques to communicate with ESP device,
+such as multiple threadings to process data and other OS dependant
+features to make library perfect for MCUs
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