Add instructions on how to run the benchmarks.
Add instructions on how to run the benchmarks.

iblech/blaze-html,iblech/blaze-html,jgm/blaze-html,jgm/blaze-html,FranklinChen/blaze-markup,mikehat/blaze-all,dylex/blaze-markup,jgm/blaze-html,Soostone/blaze-markup-haste,Soostone/blaze-html-haste,FranklinChen/blaze-markup,mikehat/blaze-all,mikehat/blaze-all,Soostone/blaze-markup-haste,dylex/blaze-markup