Merge pull request #3 from impactCn/readme

add README
diff --git a/README.md b/README.md
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+## Introduce
+License check required for shenyu release.
+
+## Function
+
+Support jar to scan if the LICENSE file matches the jar under the lib folder.
+
+## Use
+
+```shell
+java -jar shenyu-watcher xxx.tar.gz 
+```
+
+