chore: Instructions for copying the repo on a MacOS added

Author: imtodor

README.md

@@ -30,6 +30,8 @@ git clone [email protected]:telerik/docs-seed.git
 sh copy_local.sh "D:\Work\xaml-docs"
 ```
 
+> If you are running the documentation on a MacOS or another OS where the *robocopy* command is unavailable, you have to pass a second  parameter to the copy_local.sh script: `sh copy_local.sh "D:\Work\xaml-docs" true`
+
 - Go to the MY-REPO directory
 - Open a terminal of your choice (e.g., gitBash)
 - Execute the following bash command in the root folder (where the **Dockerfile** is located)