add benchmark

[stepancar]

Hello! Thank you for interesting project.
It's very interesting to compare performance of your parser and typescript.
Please, add simple perf test

[ToCSharp]

Hello.
I'm not an expert in TypeScript. Will it be correct to calculate performance in Node.js or we must connect to Standalone Server (tsserver).

import { readFileSync } from "fs";
import * as ts from "typescript";
var now = require("performance-now");
var fileName = "E:/github/TypeScript-master/lib/typescriptServices.js";
// Parse a file
var fileSource = readFileSync(fileName).toString();
var t0 = now();
var sourceFile = ts.createSourceFile(fileName, fileSource, ts.ScriptTarget.Latest, /*setParentNodes */ true);
var t1 = now();
var timeMS = t1 - t0;

[ToCSharp]

Made some tests.
It seems, Node.js is much faster then .Net TypeScriptAST. typescriptServices.js (4578 Kb) parsed 1135Ms(Node.js) and 10618(.Net). checker.ts (1321 Kb) 525 - 1173.
.Net TypeScriptAST is single threaded lib, used 1 core from 8HT on my old comp.
When I have time, I'll figure it out.

[stepancar]

@ToCSharp, thank you!