Add a syzygy.gyp_env.README file
Add a syzygy.gyp_env.README file

BUG=
R=chrisha@chromium.org, siggi@chromium.org

Review URL: https://codereview.appspot.com/179950043

pombreda/syzygy,supriyantomaftuh/syzygy,supriyantomaftuh/syzygy,sebmarchand/syzygy,wangming28/syzygy,sebmarchand/syzygy,pombreda/syzygy,pombreda/syzygy,pombreda/syzygy,pombreda/syzygy,sebmarchand/syzygy,supriyantomaftuh/syzygy,ericmckean/syzygy,Eloston/syzygy,google/syzygy,google/syzygy,sebmarchand/syzygy,google/syzygy,ericmckean/syzygy,ericmckean/syzygy,Eloston/syzygy,wangming28/syzygy,wangming28/syzygy,wangming28/syzygy,ericmckean/syzygy,google/syzygy,ericmckean/syzygy,supriyantomaftuh/syzygy,sebmarchand/syzygy