Create README.md

Author: ruslansin

README.md

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+# Launcher API (Unity) support
+Mailspring plugin. It adds support for Launcher API (Unity) notifications to the dock
+![screenshot](https://github.com/snqlby/launcher-api-support/raw/master/media/screenshot.png)
+
+# GNOME Dash to Dock extension compatibility
+It is possible to use this plugin for [Dash to Dock](https://extensions.gnome.org/extension/307/dash-to-dock/) extension. Make sure your Dash to Dock build and linux distributive have support for unity notifications. 
+You may need to install a version from the [GitHub repository](https://github.com/micheleg/dash-to-dock).
+You also need to add support for the Launcher API, if that was not provided by your DE.
+
+| Distributive  | DE            |Package   |
+|:-------------:|:-------------:|:--------:|
+| Arch Linux    | GNOME         | [libunity](https://aur.archlinux.org/packages/libunity/) |
+
+## Installation from source
+```Bash
+git clone https://github.com/snqlby/launcher-api-support.git
+cd launcher-api-support
+npm install
+```
+Open your Mailspring app and select **launcher-api-support** directory: `Developer -> Install a Plugin`