Add readme

Author: goto-bus-stop

readme.markdown

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 # tty-browserify
+
+Browser stubs for the Node.js `require('tty')` module.
+
+Browserify uses this module when you do `require('tty')` in a bundle. You should normally not use it directly.
+
+## API
+
+### `tty.isatty()`
+
+Returns false.
+
+### `new tty.ReadStream()`
+
+Throws an error.
+
+### `new tty.WriteStream()`
+
+Throws an error.
+
+## License
+
+[MIT](./LICENSE)