添加linux安装protoc脚本

readme更新

README.md

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+# 项目说明
+protobuf 数据结构定义，作为git子模块使用
+
+## protoc环境安装说明
+Linux下执行
+```
+sudo chmod +x install_protoc_linux.sh
+sudo ./install_protoc_linux.sh
+```

install_protoc_linux.sh

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+#!/bin/sh
+
+# Copy the protoc-27.4-linux-x86_64 file to the home directory
+cp -f ./protoc/protoc-27.4-linux-x86_64/bin/protoc /usr/local/bin/ 
+cp -r -f ./protoc/protoc-27.4-linux-x86_64/include/* /usr/local/include/
+chmod +x /usr/local/bin/protoc
+
+# 验证安装
+protoc --version

src/basic_signal_data.proto

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 syntax = "proto3";
 
-package rtss.basic_signal_data;
+package basic_signal_data;
 
 message Storage {
     Canvas canvas = 1;