Add GitLab project scaffold

Description

• Add approved license (commit 48284f84)
• Add contributing documentation (commit f9386c04)
• Remove README templated information (commit de2c2c62)
• Add subset of ci-templates templates to .gitlab-ci.yml (commit e4c6c9ce)
  • I took the time to update to the latest version of golangci-lint.
  • Doing the upgrade required some updates to the configuration value
  • I also removed the disabled all linters declaration. This was hiding a lot of errors in Gemnasium, and this is a good time to address them slowly and carefully during the migration.

Relates to Set up dependency-scanning analyzer project (gitlab-org/gitlab#476165 - closed)