No License

[Daandelange]

I'm just figuring out that there's no ofxImGui license at all. As ImGui is MIT, let's add a MIT license to this addon for clarity ?

Ping @prisonerjohn , @jvcleave .

[danoli3]

Dear ImGui is licensed under the MIT License, and since this is wrapping that code, probably safe to say

[jvcleave]

MIT is fine by me

[Daandelange]

Ok, I'll add it as soon as I free some time :)