Merge pull request #106 from WordPress/add/emptytheme-readme

Add a readme for the emptytheme

emptytheme/README.md

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+# Empty Theme
+
+Empty theme contains all of the boilerplate you need to get started building a block-based theme: 
+
+- An empty `theme.json` file. 
+- `functions.php` with some basic setup.
+- `style.css` to set up the theme.
+- An empty `index.php`
+
+It also includes a basic `index.html` template and `header.html` template part so that the theme works out of the box with no modifications. 
+
+For more background on the theme, [read the original PR](https://github.com/WordPress/theme-experiments/pull/81). 
+
+🌟 [Use the command line tool](https://github.com/WordPress/theme-experiments#generating-your-own-starter-theme) to generate your own brand-new theme based on this boilerplate.