add missing licence header in CMakeLists.txt

3 jobs for fix_missing_licence_headers in 4 minutes and 33 seconds (queued for 4 minutes and 6 seconds)
Status Job ID Name Coverage
  Build
passed #548663
build_pampa

00:01:09

passed #548664
build_pampa_doc

00:02:05

 
  Test
passed #548665
test_pampa

00:02:15