Added readme. Ready for soft launch.

readme.md

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+# Block Visibility User Role Add-On
+
+Need to show one or more blocks on your page (or post) to only your editors but want to keep the rest of the content public? This add-on for the [Block Visibility WordPress plugin](https://github.com/richardtape/block-visibility) allows you to do exactly that.
+
+## Examples
+
+Show one version of a block for the public and another for your site's subscribers
+
+or
+
+Only show a block to those signed in as Authors
+
+or
+
+Leave yourself a note (paragraph block for example) at the top of the page that only you, as an admin, can see.
+
+## Block Visibility
+
+Works alongside the core [Block Visibility plugin](https://github.com/richardtape/block-visibility) and [Date and Time add-on](https://github.com/richardtape/block-visibility-date-and-time) meaning you can schedule blocks for dates and times and only shown them to those users signed in with a specific role.
+
+## Who made this?
+
+My name's [Rich Tape](https://richardtape.com/). Hi!