feat(context): add SaveUploadedFile func. (#1022)

* feat(context): add SaveUploadedFile func.

* feat(context): update multiple upload examples.

* style(example): fix gofmt

* fix(example): add missing return

README.md

@@ -275,7 +275,10 @@ func main() {
 		// single file
 		file, _ := c.FormFile("file")
 		log.Println(file.Filename)
-
+        
+        // Upload the file to specific dst.
+        // c.SaveUploadedFile(file, dst)       
+		
 		c.String(http.StatusOK, fmt.Sprintf("'%s' uploaded!", file.Filename))
 	})
 	router.Run(":8080")
@@ -304,6 +307,9 @@ func main() {
 
 		for _, file := range files {
 			log.Println(file.Filename)
+			
+			// Upload the file to specific dst.
+            // c.SaveUploadedFile(file, dst)       
 		}
 		c.String(http.StatusOK, fmt.Sprintf("%d files uploaded!", len(files)))
 	})