Add benchmark script

Author: maxbrunsfeld

script/benchmark.coffee

@@ -0,0 +1,15 @@
+#!/usr/bin/env coffee
+
+handler = require '../lib/spell-check-handler'
+fs = require 'fs'
+
+pathToCheck = process.argv[2]
+console.log("Spellchecking %s...", pathToCheck)
+
+text = fs.readFileSync(pathToCheck, 'utf8')
+
+t0 = Date.now()
+result = handler({id: 1, text})
+t1 = Date.now()
+
+console.log("Found %d misspellings in %d milliseconds", result.misspellings.length, t1 - t0)