FC-11 Added content to Cheddar introduction document

Signed-off-by: Steffan Westcott <steffan.westcott@clicktravel.com>
FC-11 Correct minor typos

Signed-off-by: Steffan Westcott <steffan.westcott@clicktravel.com>
Merge pull request #15 from clicktravel-steffan/master

FC-11 Added content to Cheddar introduction document