update README.md

Author: slow-groovin

README.MD

@@ -1 +1,13 @@
-action
+# practice github action
+
+## branch `main`
+all workflows
+## branch `artifact`
+generate artifact and use in multiple jobs
+## branch `native-graalvm`
+use graalvm/setup-graalvm@v1 to build native java spring executable 
+## branch `maven-package`
+two projects to:
+1. manually deploy `.jar`to github package
+2. (with action)auto deploy  `.jar` to github package
+