added doc for how to develop with devfiles

docs/modules/user-guide/nav.adoc

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 * xref:index.adoc[]
 
 * Developer
+** xref:developing-with-devfiles.adoc[]
 ** xref:using-devfiles.adoc[]
 *** xref:adding-schema-version-to-a-devfile.adoc[]
 *** xref:adding-a-name-to-a-devfile.adoc[]

docs/modules/user-guide/pages/developing-with-devfiles.adoc

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+:description: Developing with devfiles
+:navtitle: Developing with devfiles
+:keywords: developing, devfiles
+
+include::partial$proc_developing-with-devfiles.adoc[]

docs/modules/user-guide/partials/proc_developing-with-devfiles.adoc

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+[id="proc_developing-with-devfiles_{context}"]
+= Developing with devfiles
+[role="_abstract"]
+
+Use the devfile specification to develop a Node.js “Hello World” application. Developing this application introduces you to how a devfile automates and simplifies your development process.
+
+.Prerequisites
+
+To make developing with the devfile specification easier, consider doing the following:
+
+* Install link:https://minikube.sigs.k8s.io/docs/start/[minikube] to create a Kubernetes cluster on your local machine.
+* Download link:https://kubernetes.io/docs/tasks/tools/install-kubectl-macos/[kubectl] to access your namespace.
+* Enable link:https://kubernetes.io/docs/tasks/access-application-cluster/ingress-minikube/[ingress on minikube] to access your devfile project.
+* Install the link:https://access.redhat.com/documentation/en-us/openshift_container_platform/4.6/html/cli_tools/developer-cli-odo#installing-odo[odo command line interface (CLI) tool] to execute the devfile specification.
+
+.Procedure
+
+. View the available devfiles:
++
+----
+$ odo catalog list components
+----
+. Run `odo create nodejs _<name of your project>_ --starter` to create a devfile project.
+* Add the `--starter` parameter to include the starter project currently inside the Node.js devfile specification, which makes it easier for you to develop an application.
+. Run `minikube IP` to find your cluster IP address.
+. Run `odo url create _<name you give the url>_ --ingress --host _<IP address>_.nip.io`. Doing so creates an ingress inside your cluster that you can use to access your application using the cluster IP address.
+* Example: `odo url create myfirstproject --ingress --host 192.168.64.2.nip.io`.
+. Run `odo push` to build the URL.
+
+.Verification
+
+* To verify that you built your Node.js "Hello World" application successfully, view the application in a web browser by copying and pasting the URL that was produced by running the `odo push` command. Go to the URL and view your "Hello World" application.
+
+.Additional resources
+
+To continue working with devfiles, go to xref:authoring-devfiles.adoc[Authoring devfiles].