Create a directory to put the cr tool into.
A basic README that needs more fleshing out once the tool is in, with things like links to full documentation on the wiki.

BUG=316397

Review URL: https://codereview.chromium.org/64423002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@234211 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 234211