初始化项目框架，完成部分接口开发

internal/middleware/exit.go

@@ -0,0 +1,14 @@
+package middleware
+
+import (
+	"github.com/gogf/gf/v2/errors/gerror"
+	"github.com/gogf/gf/v2/net/ghttp"
+)
+
+func Exit(r *ghttp.Request, err error) {
+	r.Response.WriteJsonExit(ghttp.DefaultHandlerResponse{
+		Code:    gerror.Code(err).Code(),
+		Message: gerror.Code(err).Message(),
+		Data:    nil,
+	})
+}