build: 添加 Dockerfile 并更新 README 文档

添加 Dockerfile 用于构建 MUSA 架构的镜像，并更新 README 文档说明构建方法

Dockerfile

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+FROM mthreads/musa:rc4.3.0-devel-ubuntu22.04-amd64 as builder
+ADD . /src
+WORKDIR /src
+RUN cmake -B build \
+  -DGGML_MUSA=ON  -DLLAMA_OPENSSL=OFF -DGGML_SCHED_NO_REALLOC=ON -DMUSA_ARCHITECTURES=${MUSA_ARCH:-22} \
+  -DCMAKE_BUILD_TYPE=Release &&\
+   cmake --build build -j
+
+FROM mthreads/musa:rc4.3.0-runtime-ubuntu22.04-amd64
+COPY --from=builder /src/build/bin /app
+WORKDIR /app
+ENTRYPOINT [ "/app/llama-cli" ]