add invite url example to readme (#487)

* add invite url example to readme

* indentation fix

* Update README.md

Author: ruvenzx

README.md

@@ -586,7 +586,9 @@ descope_client.mgmt.user.invite(
     user_tenants=[
         AssociatedTenant("my-tenant-id", ["role-name1"]),
     ],
-	sso_app_ids=["appId1"],
+    sso_app_ids=["appId1"],
+# You can override the project's User Invitation Redirect URL with this parameter
+    invite_url="invite.me"
 )
 
 # Batch invite