Add GitHub and Heroku guidance

docs/get-started/github-and-heroku.md

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+---
+layout: layouts/get-started.njk
+title: GitHub and Heroku
+tags:
+  - getStarted
+---
+
+You can use GitHub to store your prototype securely and Heroku to run it for user testing.
+
+## Setting up Git
+
+You first need to follow the NHS prototype guidance on [setting up Git](https://prototype-kit.service-manual.nhs.uk/how-tos/git).
+
+## Storing your code in GitHub
+
+Prototypes should be stored as repositories in the [GitHub NHS Digital](https://github.com/NHSDigital) organisation account.
+
+You can find guidance on how to [get access to the GitHub NHS Digital organisation](https://nhs.sharepoint.com/:u:/r/sites/X26_EngineeringCOE/SitePages/GitHub-User---how-to-request-access.aspx?csf=1&web=1&e=7WzUKB) on SharePoint.
+
+### Naming your prototype in GitHub
+
+You should name your prototype to prevent people getting confused with production services. Use `nhsapp-prototype-` followed by the name of your service, for example: `nhsapp-prototype-prescriptions`
+
+## Using Heroku to host your prototype
+
+Depending on what testing you plan to do with users, you might want to run your prototype as a website, rather than on your local device.
+
+We use Heroku to host prototypes. To host an NHS App prototype on Heroku, you first need to store your code on GitHub, then [contact the NHS App design system team](/community/help-and-feedback/), who will setup an Heroku app and URL for you.