README.md: add badges

Author: MartinPulec

README.md

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 GPUJPEG
 =======
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+[![License](https://img.shields.io/badge/License-BSD_2--Clause-orange.svg)](https://opensource.org/licenses/BSD-2-Clause)
+[![C/C++ CI](../../workflows/C%2FC%2B%2B%20CI/badge.svg)](../../actions)
+
 **JPEG** encoder and decoder library and console application for **NVIDIA GPUs**
 for high-performance image encoding and decoding. The software runs also on
 **AMD GPUs** using [ZLUDA](https://github.com/vosen/ZLUDA) (see