Update readme file with license information.

Author: dilshan

README.md

@@ -5,3 +5,9 @@ This seven segment display module is specifically designed to work with *POS* sy
 To simplify the communication interface this unit emulates a *COM* port in the host terminal. Because of this feature, this module can work with many systems without having any additional device driver(s).
 
 This display module is designed around *STM32F103CB* MCU. The firmware of this display unit operates with most of the *STM32F103C* series MCUs, which including *STM32F103C8T6* based Blue Pill board. 
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+This is open source hardware project. All the design files, documentation, firmware source code are available to download at the [project source repository](https://github.com/dilshan/usb-external-display/releases). All the content of this project are distributed under the terms of the following license:
+
+-   Hardware License: [CC BY 4.0](https://creativecommons.org/licenses/by/4.0/)
+-   Software License: [MIT](https://github.com/dilshan/usb-external-display/blob/master/LICENSE)
+-   Documentation License: [CC BY 4.0](https://creativecommons.org/licenses/by/4.0/)