Add an FAQ entry for handling file:// requests
Add an FAQ entry for handling file:// requests

Closes #1222

Change-Id: I5cb9dcb07d65d839aa4809faaea9bf2273c69c68

shaka-project/shaka-player,TheModMaker/shaka-player,shaka-project/shaka-player,vimond/shaka-player,vimond/shaka-player,tvoli/shaka-player,TheModMaker/shaka-player,tvoli/shaka-player,shaka-project/shaka-player,shaka-project/shaka-player,tvoli/shaka-player,TheModMaker/shaka-player,vimond/shaka-player,TheModMaker/shaka-player,tvoli/shaka-player