Add the RoseHosting blog

We have a lot of Linux tutorials and guides on our blog useful for sysadmins.

README.md

@@ -635,6 +635,7 @@ Various resources, such as books, websites and articles, for improving your skil
   * [Code as Craft](https://codeascraft.com/) - Etsy's Ops blog, lots of technical posts.
   * [DevOpsGuys](http://blog.devopsguys.com/) - Devops consultants who blog about operations.
   * [Rackspace Developers](https://developer.rackspace.com/blog/) - Slightly biased blog with lots of Devops Topics.
+  * [RoseHosting Blog](https://www.rosehosting.com/blog/) - Various tutorials and guides for sysadmin and Linux-related topics.
 
 
 ## Books