Create LICENSE file in the root

[fredgan]

It's not easy to know the LICENSE of this project. So I copy the license contents from page https://wxpython.org/pages/license/

It's also the best practice of common open source projects. Hoping this can be merged.

[echoix]

@swt2c Wasnt some files generated when building the source archive for this? I can't find them committed (at least on mobile)

Curiosly I noticed the same this weekend, that the license isn't interpreted in GitHub UI's, as we don't have a file stating the license text plainly.

[swt2c]

Yeah, the license file is generated during the build for the sdist in build.py and buildtools/config.py, but perhaps it could be static instead. Will have to think about this.

[fredgan]

@swt2c Do you have any ideas or plans about this currently?

[swt2c]

I need more time to think about it / review.

[newville]

A LICENSE file in the root folder does seem necessary. I understand the complication of several licenses to report for all the sub-packages used. The LICENSE file @fredgan proposes seems sufficient.

If that seems too simplistic, maybe add to that file a link to https://wxpython.org/pages/license/index.html that expresses that complication of "lots of dependencies".