add dependency note for client

funasr/runtime/python/grpc/Readme.md

@@ -5,18 +5,24 @@ The audio data is in streaming, the asr inference process is in offline.
 
 ## Steps
 
-Step 1) Generate protobuf file for grpc  (Optional, paraformer_pb2.py and paraformer_pb2_grpc.py are already generated.)
+Step 1) Generate protobuf file for grpc.
 ```
+#(Optional, paraformer_pb2.py and paraformer_pb2_grpc.py are already generated.)
 python -m grpc_tools.protoc  --proto_path=./proto -I ./proto    --python_out=. --grpc_python_out=./ ./proto/paraformer.proto
 ```
 
-Step 2) start grpc server (on server)
+Step 2) Start grpc server (on server).
 ```
 python grpc_main_server.py --port 10095
 ```
 
-Step 3) start grpc client (on client with microphone)
+Step 3) Start grpc client (on client with microphone).
 ```
+#Install dependency.
+python -m pip install pyaudio webrtcvad
+```
+```
+#Start client.
 python grpc_main_client_mic.py --host 127.0.0.1 --port 10095
 ```