ADD: router and controller

+package controller
+
+import (
+	"bunjang/service"
+	"net/http"
+
+	"github.com/labstack/echo/v4"
+)
+
+func Search(c echo.Context) error {
+	keyword := c.Param("keyword")
+	items, err := service.GetItemByKeyword(keyword)
+	if err != nil {
+		return err
+	}
+	return c.JSON(http.StatusOK, items)
+}

 package main
 
 import (
+	"bunjang/router"
+
 	"github.com/labstack/echo/v4"
 )
 
 func main() {
 	e := echo.New()
 
+	router.Init(e)
+
 	e.Logger.Fatal(e.Start(":8080"))
 }

+package router
+
+import (
+	"bunjang/controller"
+
+	"github.com/labstack/echo/v4"
+)
+
+const (
+	API        = "/api/v2"
+	APIBunJang = API + "/bunjang"
+	APIKeyword = APIBunJang + "/:keyword"
+)
+
+func Init(e *echo.Echo) {
+	e.GET(APIKeyword, controller.Search)
+}