add shorturl example code

example/shorturl/rpc/transform/internal/config/config.go

@@ -0,0 +1,13 @@
+package config
+
+import (
+	"github.com/tal-tech/go-zero/core/stores/cache"
+	"github.com/tal-tech/go-zero/rpcx"
+)
+
+type Config struct {
+	rpcx.RpcServerConf
+	DataSource string
+	Table      string
+	Cache      cache.CacheConf
+}