Add empty .watchmanconfig
Add empty .watchmanconfig

Allows a Watchman instance configured with `enforce_root_files` to watch
this directory even if `root_files` does not contain any of the files in
the directory. (Necessary to get around undesired corporate
`/etc/watchman.json` config.)

yrro/command-t,mtimkovich/command-t,wincent/command-t,wincent/command-t,wincent/command-t,mtimkovich/command-t,yrro/command-t