Add guide

guides/gitlab.md

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+# Adding a GitLab proof
+
+Let's add a decentralized GitLab proof to your OpenPGP keys. This will also work on self-hosted instances.
+
+[[toc]]
+
+## Post a GitLab proof message
+
+Log in to [gitlab.com](https://gitlab.com) or some other GitLab instance and click on **New project**.
+
+Set the project name to anything you want.
+
+Set the project slug to **gitlab_proof**.
+
+Set the project description to (make sure to replace FINGERPRINT):
+
+```
+[Verifying my OpenPGP key: openpgp4fpr:FINGERPRINT]
+```
+
+After creating the project, copy the link to the project.
+
+## Update the PGP key
+
+First, edit the key (make sure to replace FINGERPRINT):
+
+`gpg --edit-key FINGERPRINT`
+
+Add a new notation:
+
+`notation`
+
+Enter the notation (make sure to update with the link to the project copied above):
+
+`proof@metacode.biz=https://gitlab.example.com/USERNAME/gitlab_proof`
+
+Save the key:
+
+`save`
+
+Upload the key to WKD or use the following command to upload the key to [key.openpgp.org](https://keys.openpgp.org) (make sure to replace FINGERPRINT):
+
+`gpg --keyserver hkps://keys.openpgp.org --send-keys FINGERPRINT`
+
+And you're done! Reload your profile page, it should now show a verified GitLab account.