Start documentation to use Docker Desktop

Related to jupyterhub#3157

docs/source/getting_started/docker_desktop.md

@@ -0,0 +1,24 @@
+# Getting started with local development
+
+This page contains a starting point for people who want to know more about the BinderHub deployment by playing around with a local development instance running on Kubernetes with [Docker Desktop](https://docs.docker.com/desktop/).
+
+## Install Docker Desktop
+
+Install Docker Desktop on [Mac](https://docs.docker.com/desktop/setup/install/mac-install/), [Windows](https://docs.docker.com/desktop/setup/install/windows-install/), or [Linux](https://docs.docker.com/desktop/setup/install/linux/). And [turn on Kubernetes](https://docs.docker.com/desktop/features/kubernetes/#install-and-turn-on-kubernetes).
+
+## Set up `kubectl` to connect to Docker Desktop
+
+You can connect `kubectl` with Docker Desktop.
+To do so, run the following command:
+
+```
+kubectl config use-context docker-desktop
+```
+
+You can test this out by running:
+
+```
+kubectl get -A pods
+```
+
+and a list of all running pods should be printed.

docs/source/getting_started/index.rst

@@ -9,6 +9,7 @@ permissions, as well as contextual information about the mybinder.org deployment
 .. toctree::
     :maxdepth: 3
 
+    docker_desktop
     getting_started
     production_environment
     terminology