add new docs version 7.10.x

docs/versioned_docs/version-7.10.x/configuration/providers/nextcloud.md

@@ -0,0 +1,28 @@
+---
+id: nextcloud
+title: NextCloud
+---
+
+The Nextcloud provider allows you to authenticate against users in your
+Nextcloud instance.
+
+When you are using the Nextcloud provider, you must specify the urls via
+configuration, environment variable, or command line argument. Depending
+on whether your Nextcloud instance is using pretty urls your urls may be of the
+form `/index.php/apps/oauth2/*` or `/apps/oauth2/*`.
+
+Refer to the [OAuth2
+documentation](https://docs.nextcloud.com/server/latest/admin_manual/configuration_server/oauth2.html)
+to set up the client id and client secret. Your "Redirection URI" will be
+`https://internalapp.yourcompany.com/oauth2/callback`.
+
+```
+    -provider nextcloud
+    -client-id <from nextcloud admin>
+    -client-secret <from nextcloud admin>
+    -login-url="<your nextcloud url>/index.php/apps/oauth2/authorize"
+    -redeem-url="<your nextcloud url>/index.php/apps/oauth2/api/v1/token"
+    -validate-url="<your nextcloud url>/ocs/v2.php/cloud/user?format=json"
+```
+
+Note: in *all* cases the validate-url will *not* have the `index.php`.