Adding an OWNERS file to new chrome/docs folder

This folder contains the home and pillar pages for developer.chrome.com.

We need an OWNERS file so people working with these docs can commit.

NOTRY=true

Review URL: https://codereview.chromium.org/143883007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@246167 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 246167