Add project README

Author: colinrotherham

README.md

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+# NHS.UK frontend
+
+NHS.UK frontend contains the code you need to start building user interfaces for NHS websites and services.
+
+## Guidance
+
+Visit the [NHS digital service manual](https://service-manual.nhs.uk/) for examples of components and guidance for when to use them. If we haven’t yet published guidance on the component you want, please [email us](mailto:service-manual@nhs.net) or get in touch on the [NHS digital service manual Slack workspace](https://join.slack.com/t/nhs-service-manual/shared_invite/enQtNTIyOTEyNjU3NDkyLTk4NDQ3YzkwYzk1Njk5YjAxYTI5YTVkZmUxMGQ0ZjA3NjMyM2ZkNjBlMWMxODVjZjYzNzg1ZmU4MWY1NmE2YzE).
+
+## How to install
+
+See the [`nhsuk-frontend` README.md](/packages/nhsuk-frontend/README.md) in the packages directory for details.
+
+## Browsers and assistive technology
+
+Visit our [support for browsers and assistive technology](/docs/contributing/browser-support.md), for details on operating systems and software.
+
+## Contribute
+
+Read our [contributing guidelines](CONTRIBUTING.md) to contribute to NHS.UK frontend.
+
+## Development environment
+
+[![Gitpod ready-to-code](https://img.shields.io/badge/Gitpod-ready--to--code-blue?logo=gitpod)](https://gitpod.io/#https://github.com/nhsuk/nhsuk-frontend)
+
+## Get in touch
+
+NHS.UK frontend is maintained by NHS England. [Email us](mailto:service-manual@nhs.net), open a [GitHub issue](https://github.com/nhsuk/nhsuk-frontend/issues/new) or get in touch on the [NHS digital service manual Slack workspace](https://join.slack.com/t/nhs-service-manual/shared_invite/enQtNTIyOTEyNjU3NDkyLTk4NDQ3YzkwYzk1Njk5YjAxYTI5YTVkZmUxMGQ0ZjA3NjMyM2ZkNjBlMWMxODVjZjYzNzg1ZmU4MWY1NmE2YzE).
+
+## Licence
+
+The codebase is released under the MIT Licence, unless stated otherwise. This covers both the codebase and any sample code in the documentation. The documentation is © NHS England and available under the terms of the Open Government 3.0 licence.