Consider providing full OSS license

[filiph]

I am not a lawyer, so take everything here with a grain of salt.

I was a bit worried when I saw that GitHub doesn't autodetect the OSS license of this project. It does link to the LICENSE file, but only says "see license".

I'd rather like to see:

From what I understand from the legalese at https://www.apache.org/licenses/LICENSE-2.0, I think you're not doing anything wrong, technically, by showing only the short text. But I, for one, would feel better if GitHub just automatically said the project is Apache 2.0, like it does for many other OSS projects.

See https://github.com/moby/moby/blob/master/LICENSE for an example how to include the full license.

[simc]

Initially I used the long version but the Flutter showLicensePage() method did not like it #34.

I'm sure it makes not difference whether the full license is included but I'll change that.

[simc]

Done.