Added link to GitFlow video

doc/gitlab-basics/README.md

@@ -25,6 +25,8 @@ The following are guides to basic GitLab functionality:
 - [Create an issue](../user/project/issues/create_new_issue.md), to start collaborating within a project.
 - [Create a merge request](add-merge-request.md), to request changes made in a branch be merged into a project's repository.
 
+For an introduction to many of the topics covered in this section, watch the [GitLab Flow](https://youtu.be/InKNIvky2KE) video.
+
 ## Git basics
 
 If you're familiar with Git on the command line, you can interact with your GitLab projects just as you would with any other Git repository.