add vendor

vendor/github.com/gin-gonic/contrib/cache/example/example.go

@@ -0,0 +1,25 @@
+package main
+
+import (
+	"fmt"
+	"github.com/gin-gonic/contrib/cache"
+	"github.com/gin-gonic/gin"
+	"time"
+)
+
+func main() {
+	r := gin.Default()
+
+	store := cache.NewInMemoryStore(time.Second)
+	// Cached Page
+	r.GET("/ping", func(c *gin.Context) {
+		c.String(200, "pong "+fmt.Sprint(time.Now().Unix()))
+	})
+
+	r.GET("/cache_ping", cache.CachePage(store, time.Minute, func(c *gin.Context) {
+		c.String(200, "pong "+fmt.Sprint(time.Now().Unix()))
+	}))
+
+	// Listen and Server in 0.0.0.0:8080
+	r.Run(":8080")
+}