Fix License

[cuttestkittensrule]

Fixes a couple of issues with licensing

1. We have the "how to add copyright comments" appendix in our license. We don't need it
   • Fixed in this PR by removing it
2. We don't have any copyright comments in any files
   • Fixed for Java files by making spotless add the copyright message in java files as comments

Could add copyright comments in more kinds of files (see spotless docs for more info).
Also, do we want to enable automatic updating of the copyright? I haven't tested if this will work without git though

[spderman3333]

Lgtm, though i think @vdikov should take a look too, as I have not played around with licencing.

[kcooney]

Love it!

[cuttestkittensrule]

I looked at both spotless's code, and did a manual test. Spotless will work perfectly fine if git is not installed, as it doesn't shell out git. Do we want to make it automatically update the licenses of the files you change (if needed) when you make a change?

[kcooney]

I looked at both spotless's code, and did a manual test. Spotless will work perfectly fine if git is not installed, as it doesn't shell out git. Do we want to make it automatically update the licenses of the files you change (if needed) when you make a change?

Can we do that in a different PR? Lets submit this as-is.