add cli tool

[milahu]

similar to terser

minimal version

#! /usr/bin/env node

var {minify} = require('dts-minify').createMinifier(require('typescript'));
var fs = require('fs');
var {argv} = process;

if (argv[2] == '-w')
  for (var f of argv.slice(3)) {
    console.log(f);
    fs.writeFileSync(f, minify(fs.readFileSync(f, 'utf8')), 'utf8');
  }
else if (argv[2])
  console.log(minify(fs.readFileSync(argv[2], 'utf8')));
else
  console.log(minify(fs.readFileSync(0, 'utf8'))); // read stdin. fails on large inputs