Added a readme file

Author: remcos

README.md

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+# Documentation
+
+## Description
+This widget allows you to send a pre-filled HTML email from your phone. It will let you choose which native app to use and open an email object in that application.
+
+## Typical usage scenario
+*	A user uses the contact button in a hybrid app, which should create a predefined e-mail with rich formatting.
+
+## Features and limitations
+*	The e-mail can be send using the mobile app of your choice (both iOS and Android).
+*	The To, CC, Subject and Body field can be filled in.
+
+## Configuration
+1.	Create an email entity, containing at least To, CC, Subject and Body attributes.
+2.	Create a forward-screen, which takes an email object as page parameter, containing the widget in the data view.
+3.	Configure the widget to pass the correct attribute values.