Add readme & .appcast.xml

Author: codegaze

.appcast.xml

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+<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<rss xmlns:sparkle="http://www.andymatuschak.org/xml-namespaces/sparkle" xmlns:dc="http://purl.org/dc/elements/1.1/" version="2.0">
+  <channel>
+    <title>Transifex Sketch Plugin</title>
+    <link>https://raw.githubusercontent.com/transifex/transifex-sketch-plugin/master/.appcast.xml</link>
+    <description>Start localization at the design phase with Transifex.</description>
+    <language>en</language>
+    <item>
+      <enclosure url="https://github.com/transifex/transifex-sketch-plugin/releases/download/v1.0.0/transifex-sketch.sketchplugin.zip" sparkle:version="1.0.0"/>
+    </item>
+  </channel>
+</rss>

README.md

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+# Transifex Sketch Plugin
+
+Start localization at the design phase. Accelerate your workflow by bringing the Product, Design and Localization teams closer.
+
+## Installation
+* Download the [latest release](https://github.com/transifex/transifex-sketch-plugin/releases/latest/download/) of Transifex Sketch plugin.
+* Unzip the file.
+* Double click transifex-sketch.sketchplugin file.
+
+## Documentation
+Read our documentation about the Transifex Sketch plugin: https://docs.transifex.com/transifex-integrations/sketch-integration
+
+## Support
+Contact us at [email protected] with any questions or feature requests.