新增readme

Author: ZHEQIUSHUI

README.md

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+# opus-mt-en-zh-axera
+基于 [opus-mt-en-zh](https://huggingface.co/Helsinki-NLP/opus-mt-en-zh) 模型的 英文->中文 翻译模型。
+
+## 编译
+```shell
+./build.sh          # 本地编译
+./build_aarch64.sh  # aarch64 交叉编译
+```
+
+## 用例
+
+详细代码见 [test_translate.cpp](tests/test_translate.cpp)
+```C++
+std::string text = "Hello, Who are you";
+std::string model_path = "opus-mt-en-zh.axmodel";
+std::string tokenizer_dir = "tests/opus-mt-en-zh";
+
+Translator translator;
+int ret = translator.Init(model_path, tokenizer_dir);
+if (ret != 0)
+{
+    printf("init translator failed\n");
+    return;
+}
+std::string output = translator.Translate(text);
+printf("output: %s\n", output.c_str());  // 你好,你是谁
+```
+
+## 参考资料
+* [sentencepiece](https://github.com/google/sentencepiece)
+* [opus-mt-en-zh](https://huggingface.co/Helsinki-NLP/opus-mt-en-zh)
+
+## 社区
+QQ 群: 139953715