Add GPL license file

Signed-off-by: Rafael Ravedutti <rrlmachado@inf.ufpr.br>
2 jobs for add_license_file in 3 minutes and 45 seconds (queued for 1 second)
Status Job ID Name Coverage
  Test
passed #28321
ruby postgres
test

00:01:11

 
  Build
passed #28322
docker build
build

00:02:33