Add LICENSE file
When you transferred the blocklists to GitLab, it appears that you haven't attached a license to it. This PR adds the GPL-v3.0 license (which you used for the original GitHub repo), under your name.
When you transferred the blocklists to GitLab, it appears that you haven't attached a license to it. This PR adds the GPL-v3.0 license (which you used for the original GitHub repo), under your name.