feat: add readme

README.md

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+# Log4j2-Vaccine
+一款用于`log4j2`漏洞的疫苗，基于`Instrumentation`机制进行RASP防护，Patch了
+`org.apache.logging.log4j.core.net.JndiManager`的`lookup`方法，部分代码借用了`arthas`的实现
+
+## Usage
+启动Loader
+```
+java -jar loader.jar --agent agent.jar
+```
+
+选择需要Patch的进程(输入序号即可)
+```
+[INFO] Found existing java process, please choose one and hit RETURN.
+* [1]: 50508 log4j2vuln3-0.0.1-SNAPSHOT.jar
+
+```
+
+Patch成功
+![](https://dinfinite.oss-cn-beijing.aliyuncs.com/image/20211210162759.png)