Provide instructions how to build d8.jar
Provide instructions how to build d8.jar

Summary: More detailed instructions should help with maintenance.

Test Plan: Try these instructions

Reviewed By: ttsugriy

fbshipit-source-id: abbb697

rmaz/buck,clonetwin26/buck,SeleniumHQ/buck,brettwooldridge/buck,brettwooldridge/buck,SeleniumHQ/buck,nguyentruongtho/buck,JoelMarcey/buck,shs96c/buck,zpao/buck,ilya-klyuchnikov/buck,nguyentruongtho/buck,LegNeato/buck,shs96c/buck,brettwooldridge/buck,LegNeato/buck,Addepar/buck,kageiit/buck,LegNeato/buck,JoelMarcey/buck,romanoid/buck,SeleniumHQ/buck,ilya-klyuchnikov/buck,clonetwin26/buck,rmaz/buck,Addepar/buck,Addepar/buck,brettwooldridge/buck,ilya-klyuchnikov/buck,zpao/buck,LegNeato/buck,rmaz/buck,romanoid/buck,clonetwin26/buck,brettwooldridge/buck,Addepar/buck,JoelMarcey/buck,SeleniumHQ/buck,ilya-klyuchnikov/buck,facebook/buck,romanoid/buck,brettwooldridge/buck,ilya-klyuchnikov/buck,clonetwin26/buck,rmaz/buck,SeleniumHQ/buck,rmaz/buck,ilya-klyuchnikov/buck,LegNeato/buck,shs96c/buck,shs96c/buck,shs96c/buck,ilya-klyuchnikov/buck,kageiit/buck,romanoid/buck,Addepar/buck,zpao/buck,kageiit/buck,romanoid/buck,rmaz/buck,brettwooldridge/buck,facebook/buck,LegNeato/buck,zpao/buck,LegNeato/buck,clonetwin26/buck,JoelMarcey/buck,nguyentruongtho/buck,SeleniumHQ/buck,SeleniumHQ/buck,brettwooldridge/buck,zpao/buck,shs96c/buck,romanoid/buck,JoelMarcey/buck,shs96c/buck,facebook/buck,shs96c/buck,nguyentruongtho/buck,rmaz/buck,clonetwin26/buck,Addepar/buck,rmaz/buck,ilya-klyuchnikov/buck,ilya-klyuchnikov/buck,facebook/buck,romanoid/buck,rmaz/buck,LegNeato/buck,JoelMarcey/buck,zpao/buck,shs96c/buck,romanoid/buck,SeleniumHQ/buck,JoelMarcey/buck,LegNeato/buck,romanoid/buck,SeleniumHQ/buck,ilya-klyuchnikov/buck,zpao/buck,SeleniumHQ/buck,JoelMarcey/buck,Addepar/buck,shs96c/buck,facebook/buck,shs96c/buck,romanoid/buck,kageiit/buck,Addepar/buck,ilya-klyuchnikov/buck,clonetwin26/buck,shs96c/buck,clonetwin26/buck,JoelMarcey/buck,nguyentruongtho/buck,clonetwin26/buck,LegNeato/buck,facebook/buck,brettwooldridge/buck,romanoid/buck,SeleniumHQ/buck,nguyentruongtho/buck,kageiit/buck,clonetwin26/buck,SeleniumHQ/buck,JoelMarcey/buck,facebook/buck,brettwooldridge/buck,Addepar/buck,LegNeato/buck,rmaz/buck,clonetwin26/buck,LegNeato/buck,JoelMarcey/buck,clonetwin26/buck,clonetwin26/buck,JoelMarcey/buck,ilya-klyuchnikov/buck,rmaz/buck,Addepar/buck,Addepar/buck,ilya-klyuchnikov/buck,Addepar/buck,kageiit/buck,rmaz/buck,nguyentruongtho/buck,JoelMarcey/buck,brettwooldridge/buck,Addepar/buck,SeleniumHQ/buck,romanoid/buck,LegNeato/buck,romanoid/buck,kageiit/buck,brettwooldridge/buck,brettwooldridge/buck,shs96c/buck,rmaz/buck