Update LICENSE.md

[alice-i-cecile]

1. Remove from README (duplicative).
2. Figure out how to properly credit both Stretch2 contributors and original Visly team.

[mockersf]

vislyhq/stretch#85 should also be merged in this repo so that crates.io can correctly display the license
vislyhq/stretch#97 probably too

[TimJentzsch]

Stretch is licensed under MIT while bevy is dual-licensed with Apache as well. Is this going to cause issues?

[alice-i-cecile]

It won't cause issues; we can just leave this as a separate repo under just MIT.

[NickAcPT]

2. Figure out how to properly credit both Stretch2 contributors and original Visly team.

Regarding this, I think the best action would be to add an extra line of copyright like explained in this Stack Exchange answer. Although the answer talks about a code port, I think it can still apply on a fork of a project.

So for this repo, adding something like the following below the existing Copyright line might be enough:

Copyright (c) 2022 Dioxus

[alice-i-cecile]

Copyright (c) 2022 Dioxus

I would change this to Stretch2 contributors (or whatever name we end up on), but otherwise this sounds great to me.