Auth: Add docs for the SSO Settings get endpoint (#80240)

* add docs for sso-settings get endpoint

* Update docs/sources/developers/http_api/sso-settings.md

Co-authored-by: Misi <mgyongyosi@users.noreply.github.com>

* Update docs/sources/developers/http_api/sso-settings.md

Co-authored-by: Misi <mgyongyosi@users.noreply.github.com>

---------

Co-authored-by: Misi <mgyongyosi@users.noreply.github.com>

docs/sources/developers/http_api/sso-settings.md

@@ -24,6 +24,58 @@ title: SSO Settings API
 
 The API can be used to create, update, delete, get, and list SSO Settings.
 
+## Get SSO Settings
+
+`GET /api/v1/sso-settings/:provider`
+
+Gets the SSO Settings for a provider.
+
+**Required permissions**
+
+See note in the [introduction]({{< ref "#sso-settings" >}}) for an explanation.
+
+| Action          | Scope                        |
+| --------------- | ---------------------------- |
+| `settings:read` | `settings:auth.{provider}:*` |
+
+**Example Request**:
+
+```http
+GET /api/v1/sso-settings/github HTTP/1.1
+Accept: application/json
+Content-Type: application/json
+Authorization: Bearer eyJrIjoiT0tTcG1pUlY2RnVKZTFVaDFsNFZXdE9ZWmNrMkZYbk
+```
+
+**Example Response**:
+
+```http
+HTTP/1.1 200
+Content-Type: application/json
+ETag: db87f729761898ee
+{
+  "id":        "1",
+  "provider":  "github",
+  "settings": {
+    "apiUrl": "https://api.github.com/user",
+    "clientId": "my_github_client",
+    "clientSecret": "*********",
+    "enabled": true,
+    "scopes": "user:email,read:org"
+    // rest of the settings
+  },
+  "source":    "system",
+}
+```
+
+Status Codes:
+
+- **200** – SSO Settings found
+- **400** – Bad Request
+- **401** – Unauthorized
+- **403** – Access Denied
+- **404** – SSO Settings not found
+
 ## Update SSO Settings
 
 `PUT /api/v1/sso-settings/:provider`