(DOCSP-26157) Adds link to cluster create command and config file (#80)

* (DOCSP-26157) Adds link to cluster create command and config file

* Includes changes from copy review

Author: sarahsimpers

source/atlas-cli-quickstart.txt

@@ -24,6 +24,11 @@ This tutorial demonstrates how to use the ``atlas quickstart`` command to:
 To perform all of these steps while also creating a new |service|
 account, see :ref:`atlas-cli-onboarding`.
 
+To create a {+cluster+} using a configuration file, run the
+:ref:`atlas-clusters-create` command with the ``--file`` option instead
+of ``atlas quickstart``. To learn more about the configuration file
+for an |service| {+cluster+}, see :ref:`atlas-cli-cluster-config-file`.
+
 .. _atlas-cli-quick-start-reqs:
 
 Prerequisites