Improve documentation

[after-ephemera]

I'd love to have some real documentation so the project can get found on npmjs.com. This would include instructions on how to use serialwriter, and common gotchas.

[nicknadeau]

Hello, I'm new to open source and would like to take this one on

[after-ephemera]

@nicknadeau I'd love that! Feel free to have a go at it and let me know if you have any questions!

[mdimovich]

Is this issue still open? I'm also new to open source and know a bit of markdown, so I could clean up the document and make it look nice

[after-ephemera]

@mdimovich yes it is open and I welcome all contributions!

[mdimovich]

Just sent a pull request! Let me know what you think :)

[after-ephemera]

Thanks to @mdimovich for updating the styling and clearing up some wording on the README. The next steps on this issue will be to

1. Add a "Contributing" section
2. Add an "Overview" section. This would offer some use cases, and why it would be useful to print serial output to a file.

[tuhinmallick]

Is this issue still available then I would like to give it a try.

[after-ephemera]

I haven't touched this repo in a while but I'd be happy to have you look it over and contribute where you can @tuhinmallick.