Added a link to video in README.md (#3)

MaryLynJuana · tshemsedinov · commit 8d3fe61da516 · 2019-01-22T20:49:40.000+02:00
diff --git a/README.md b/README.md
@@ -1,2 +1,3 @@
 Sandboxes
 ===============
+[![Модули, слои, структура проекта, песочницы](https://img.youtube.com/vi/O7A9chb573E/0.jpg)](https://www.youtube.com/watch?v=O7A9chb573E)

Original file line number	Diff line number	Diff line change
`@@ -1,2 +1,3 @@`
`1`	`1`	`Sandboxes`
`2`	`2`	`===============`
	`3`	`+[![Модули, слои, структура проекта, песочницы](https://img.youtube.com/vi/O7A9chb573E/0.jpg)](https://www.youtube.com/watch?v=O7A9chb573E)`