Publish sherpa_onnx.har for HarmonyOS (#1572)

harmony-os/SherpaOnnxHar/sherpa_onnx/src/main/cpp/libs/.gitignore

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+*.so

harmony-os/SherpaOnnxHar/sherpa_onnx/src/main/cpp/libs/README.md

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+# Introduction
+
+You need to get the following four `.so` files using
+
+  - [build-ohos-arm64-v8a.sh](https://github.com/k2-fsa/sherpa-onnx/blob/master/build-ohos-arm64-v8a.sh)
+  - [build-ohos-x86-64.sh](https://github.com/k2-fsa/sherpa-onnx/blob/master/build-ohos-x86-64.sh)
+
+```
+.
+├── README.md
+├── arm64-v8a
+│   ├── libonnxruntime.so
+│   └── libsherpa-onnx-c-api.so
+└── x86_64
+    ├── libonnxruntime.so
+    └── libsherpa-onnx-c-api.so
+```