add windows build badge into README.md (#16)

README.md

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 # libLLM: Efficient inference of large language models.
 
-[![Linux](https://github.com/ling0322/libllm/actions/workflows/cmake-linux.yml/badge.svg?branch=main)](https://github.com/ling0322/libllm/actions/workflows/cmake-linux.yml)
+[![Linux](https://github.com/ling0322/libllm/actions/workflows/cmake-linux.yml/badge.svg?branch=main)](https://github.com/ling0322/libllm/actions/workflows/cmake-linux.yml) [![Windows](https://github.com/ling0322/libllm/actions/workflows/cmake-windows.yml/badge.svg?branch=main)](https://github.com/ling0322/libllm/actions/workflows/cmake-windows.yml)
 
 Welcome to libLLM, an open-source project designed for efficient inference of large language models (LLM) on ordinary personal computers and mobile devices. The core is implemented in C++14, without any third-party dependencies (such as BLAS or SentencePiece), enabling seamless operation across a variety of devices.