Merge pull request #22 from jacobalberty/jalber/zitadel

doc: Add zitadel documentation
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# Zitadel
Follow these steps to integrate **Zitadel** with **Pangolin SSO** using OpenID Connect (OIDC).
## 1. Prerequisites
These instructions assume you have a working Zitadel organization and project setup already.
You need to configure an application in Zitadel:
1. Open an existing project and in `Applications` click `New`:
1. Set the name to something memorable (eg. Pangolin)
2. For `Type of application` choose `Web`
3. For `Authentication Method` choose `Code`
4. Leave `Redirect URIs` blank for now
5. When you click create, you'll be shown the `ClientSecret` and `ClientId`. Make sure to save these somewhere secure - you won't be able to see the Client Secret again.
2. Click `Token settings` then change `Auth Token Type` to `JWT` and check the `User Info inside ID Token` box finally hit `Save`
3. Open `URLs` and make note of:
- `Authorization Endpoint`
- `Token Endpoint`
## 2. Configure an Identity Provider in Pangolin
In Pangolin, go to `Identity Providers` and click `Add Identity Provider`:
1. Set the name to something memorable (eg. Zitadel)
2. In the `OAuth2/OIDC Configuration` section, fill the following fields:
1. `Client ID`: You should have the value for this from the Zitadel setup earlier
2. `Client Secret`: You should also have this value
3. `Authorization URL`: Use `Authorization Endpoint` from earlier
4. `Token URL`: Use `Token Endpoint` from earlier
3. In the `Token Configuration` section, set `Identifier Path` to `preferred_username`
When you're done, click `Create Identity Provider`.
Now copy the Redirect URL displayed in the `General Settings` section.
## 3. Complete the setup in your Zitadel application
Lastly, you need to edit your `Redirect Settings` in your Zitadel application. Add the URL you copied to the `Redirect URIs`, then hit the `+` button and finally `Save`.
## 4. Ready to Test!
The configuration is now complete. If you've configured a user (see below), try logging in!
## User Configuration in Pangolin
:::note
Username Configuration:
- Use the `Preferred login name` value from Zitadel as the username
- While Zitadel provides a `sub` claim in the JWT that matches the numeric user ID in Zitadel, we recommend using the preferred username for better user management and readability
:::
To create a user in an Organization, set the following:
- `User Type`: `External User`
- `Identity Provider`: The name you set for the identity provider (we'll assume `Zitadel` here)
- `Role`: Whatever role you want to give the user
The other fields are optional.