add readme, generate protobuf file

funasr/runtime/python/grpc/Readme.md

@@ -0,0 +1,16 @@
+## using paraformer with grpc
+
+We can send streaming audio data to server in real-time with grpc client every 10 ms e.g., and get transcribed text when stop speaking.
+The audio data is in streaming, the asr inference process is in offline.
+
+
+
+Step 1) Generate protobuf file for grpc
+```
+python -m grpc_tools.protoc  --proto_path=./proto -I ./proto    --python_out=. --grpc_python_out=./ ./proto/paraformer.proto
+```
+
+Step 2) start grpc server
+
+
+Step 3) start grpc client