Add README and screenshots

Include some background information about why I made this plus some
screenshots to get the visual message and demo across.

Also include a note about installation and license information.

3 files changed, 33 insertions, 0 deletions

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+Equalize Sidebearings Key
+=========================
+
+A RoboFont extension that allows sidebearings to be equalized using a hotkey in
+the Space Center.
+
+The hotkey can be customised in the extension's preferences.
+
+RoboFont provides an option to equalize a glyph's sidebearings via a contextual
+menu item:
+
+![Equalize sidebearings menu](screenshots/RoboFont-contextual-menu.png)
+
+Because of the mouse precision required, the default method is much slower than
+a keyboard equivalent.
+
+This extension enables the same functionality to be triggered by a customisable
+hotkey (which defaults to the `e` key):
+
+![Equalize Sidebearings Key extension
+demo](screenshots/Equalize-Sidebearings.gif)
+
+(Font used in screenshots is [Fira Sans Bold](http://mozilla.github.io/Fira/).)
+
+
+## Installation
+Download the extension from the [releases
+page](https://github.com/teddywing/RoboFont-Equalize-Sidebearings-Key).
+Double-click it to install.
+
+
+## License
+Licensed under the MIT license. See the included LICENSE file.
diff --git a/screenshots/Equalize-Sidebearings.gif b/screenshots/Equalize-Sidebearings.gif
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diff --git a/screenshots/RoboFont-contextual-menu.png b/screenshots/RoboFont-contextual-menu.png
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