modify example

README.md

@@ -1 +1,16 @@
-# go-admin example
+# go-admin example
+
+a example show how to run go-admin
+
+## step 1
+
+```shell
+git clone https://github.com/chenhg5/example.git
+```
+
+## step 2
+
+```shell
+GO111MODULE=on go run main.go
+```
+