Add license file

[gurjeet]

Hi Tim,

I, and I'm sure many other folks will really appreciate it if you'd add an open source license to the project. That'll make it easier for people to contribute to the project.

I have created the small PR (#4) to make a small contribution, and I hope to contribute more. But in absence of a license file it's not clear how, or if, others are allowed to use this project. I'm sure many people won't consider using or contributing to a project unless it has a license that they agree with.

I have seen you use MIT license in another project, so I have create PR #5 using the same content, and changing the copyright year. Please feel free to reject that PR and use another license, if you like; I wouldn't mind :-)

[mitxela]

Hi gurjeet, I appreciate the interest in this project.

It's difficult for me to accept pull requests as the public branch here is about 300 commits behind my development branch. I'm not really sure what direction I want to take this project in, it's possible I'll publish it all at some point or I might just forget about it for a long time. I would like to host a demo of the collaborative version, but it was written as a proof of concept without security in mind, so it's not something I want to host publicly without patching it up.

I'm not convinced MIT is the right license here, I don't know what would be, but at the end of the day it's just a static html and javascript file, there's nothing I can do to stop anyone doing whatever they like with it.