Merge pull request #2444 from spotify/orkohunter/2415-docs-auth-in-getting-started

docs/getting-started/running-backstage-locally.md

@@ -4,8 +4,8 @@ title: Running Backstage Locally
 ---
 
 First make sure you are using NodeJS with an Active LTS Release, currently v12.
-This is made easy with a version manager such as nvm which allows for version
-switching.
+This is made easy with a version manager such as
+[nvm](https://github.com/nvm-sh/nvm) which allows for version switching.
 
 ```bash
 # Checking your version
@@ -58,6 +58,17 @@ yarn start
 That starts up the frontend on port 3000, and should automatically open a
 browser window showing it.
 
+## Authentication
+
+When Backstage starts, you can choose to enter as a Guest user and start
+exploring.
+
+But you can also set up any of the available authentication methods. The easiest
+option will be GitHub. To setup GitHub authentication in Backstage, see
+[these instructions](https://github.com/spotify/backstage/tree/master/plugins/auth-backend#github).
+
+---
+
 Congratulations! That should be it. Let us know how it went
 [on discord](https://discord.gg/EBHEGzX), file issues for any
 [feature](https://github.com/spotify/backstage/issues/new?labels=help+wanted&template=feature_template.md)
@@ -78,5 +89,3 @@ instance of Backstage with your own plugins.
 - [Create a Backstage Plugin](../plugins/create-a-plugin.md)
 - [Structure of a Plugin](../plugins/structure-of-a-plugin.md)
 - [Utility APIs](../api/utility-apis.md)
-
-[Back to Docs](../README.md)