Add .gitignore for chronicle submodule.
Add .gitignore for chronicle submodule.

aruanruan/copycat,atomix/atomix,madjam/copycat,tempbottle/copycat,quantiply-fork/copycat,madjam/copycat,arnonmoscona/copycat,aruanruan/copycat,arnonmoscona/copycat,kuujo/copycat,atomix/atomix,tempbottle/copycat,kuujo/copycat