Docs: Add basic docs.

Only a crude Quick Start right now.

CONTRIBUTING.md

@@ -1,3 +1,5 @@
+# Contributing
+
 Thanks for looking here! We'd love your help. The micro:bit project is only
 possible through contributions of companies and individuals around the world.
 

docs/_config.yml

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+remote_theme: pmarsceill/just-the-docs
+
+# Markdown settings: https://jekyllrb.com/docs/configuration/markdown/
+kramdown:
+  # GitHub flavoured markdown
+  input: GFM
+  # Interprets line breaks literally
+  hard_wrap: false
+
+# Just The Docs settings
+
+# Enable or disable the site search
+search_enabled: true
+# Aux links for the upper right navigation
+aux_links:
+  'View on GitHub':
+    - 'https://github.com/microbit-foundation/microbit-universal-hex/'
+# Color scheme currently only supports "dark" or nil (default)
+color_scheme: 'light'

docs/contributing.md

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+---
+layout: page
+title: Contributing
+nav_order: 3
+---
+
+# Contributing
+
+{: .no_toc }
+
+## Table of contents
+
+{: .no_toc .text-delta }
+
+1. TOC
+   {:toc}
+
+## How To Contribute
+
+WIP.
+
+## Code Of Conduct
+
+WIP.
+
+## Bugs
+
+Issue tracker: https://github.com/microbit-foundation/microbit-fs/issues
+
+## Development Workflow
+
+- `npm install` to install dependencies
+- `npm test` runs the complete test suite
+- `npm build` create a build with all the output formats

docs/index.md

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+---
+layout: default
+title: Home
+homepage: true
+permalink: /
+nav_order: 1
+---
+
+# micro:bit Universal Hex
+
+{: .fs-9 }
+
+<img alt="microbit-universal-hex logo" src="img/microbit-uh-logo.png" style="max-height: 100px; float: left; padding-right: 16px;">
+
+Create Universal Hex files for the micro:bit.
+{: .fs-6 .fw-300 }
+
+[Quick Guide](quick-guide.html){: .btn .btn-primary .fs-5 .mb-4 .mb-md-0 .mr-2 }
+[View it on GitHub](https://github.com/microbit-foundation/microbit-universal-hex/){: .btn .fs-5 .mb-4 .mb-md-0 }
+
+---
+
+The documentation is currently a work in progress.
+
+The menu on the left shows you the available documentation.