KB: New articles added (cron and ssh/shell usage)

We added a new articles to our Knowledge Base.

One article is dedicated to Crons and explaining how cron jobs are working, how to create a new cron job, difference between webcron and CLI cron and more.

The second one is dedicated to SSH/Shell usage. We explaining available commands, special commands and their syntax.

Hopefuly both articles will be useful for you. Any comments and suggestions are welcome.