Started the basics page for PHP. Basic echo command to get new users to see something and will add some more material to this tomorrow.

@tom103 thanks for the PR.
Your branch name should start with one of fix/, feature/, translate/ prefixes. Name, your branches correctly next time, please.
Please, review our Guidelines for Contributing, thank you!.

@tom103 you're in wrong repo, wiki articles should go to https://github.com/FreeCodeCamp/wiki repository, thanks for the PR though. And use Markdown instead of HTML.