add the video tutorial

Arielsui · web-flow · commit 3ff4f109269b · 2017-06-20T23:26:16.000+12:00
add the youtube link
diff --git a/video b/video
@@ -0,0 +1 @@
+https://www.youtube.com/watch?v=BCQHnlnPusY&t=2s

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1 @@`
	`1`	`+https://www.youtube.com/watch?v=BCQHnlnPusY&t=2s`