[ADD] 记录处理过程

README.md

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 # Logstash Java Plugin
 
-[![Travis Build Status](https://travis-ci.com/logstash-plugins/logstash-output-java_output_example.svg)](https://travis-ci.com/logstash-plugins/logstash-output-java_output_example)
-
 This is a Java plugin for [Logstash](https://github.com/elastic/logstash).
 
 It is fully free and fully open source. The license is Apache 2.0, meaning you are free to use it however you want.
 
 The documentation for Logstash Java plugins is available [here](https://www.elastic.co/guide/en/logstash/current/java-output-plugin.html).
+
+---
+
+# 过程记录
+- 根据指引下载 tag 版本为 v7.17.2 的代码：
+  git clone -b v7.17.2 https://github.com/elastic/logstash.git
+- 并进行编译，以得到 jar 包:
+  windows: .\gradlew.bat assemble
+- 在插件工程根目录创建 gradle.properties 配置文件并添加配置([build.gradle](build.gradle)有2处要用到)
+  LOGSTASH_CORE_PATH=<target_folder>/logstash-core
+- 配置引用相关依赖，编写插件逻辑，编译插件
+  .\gradlew.bat gem 或  .\gradlew.bat gem --warning-mode all
+- 下载可运行的[二进行文件](https://www.elastic.co/cn/downloads/past-releases/logstash-7-17-2)到无中文的目录
+- 将编译好的[logstash-output-rocketmq-0.0.1.gem](logstash-output-rocketmq-0.0.1.gem)复制到二进制文件解压目录中进行安装
+  .\bin\logstash-plugin install --no-verify --local logstash-output-rocketmq-0.0.1.gem
+- 添加配置文件并启动程序并验证
+  .\bin\logstash -f logstash-test-jdbc.conf