Add README.md
Add readme file with high-level explanation of the information flow and the steps needed to adapt the script to new wikis.
How to register an account on GitLab. To prevent spam, new accounts are locked until approved by an admin or the approver bot. You can also file an unlock request to expedite access.
Support: mw:GitLab, how to host a project on GitLab, #wikimedia-gitlab on libera.chat, #GitLab on Phabricator.
Add readme file with high-level explanation of the information flow and the steps needed to adapt the script to new wikis.