docs(readme): Start adding documentation for React version

docs/latest/README.md

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+##### Looking for your Deploy Preview? - <a onclick="function redirect() { window.location.href='/demo/'; } redirect();">Deploy Preview for Viewer</a>
+
+# Introduction
+
+The [Open Health Imaging Foundation](https://www.ohif.org) is developing an open source framework for constructing web-based medical imaging applications.
+
+## The **OHIF Viewer**: A general purpose DICOM Viewer ([demo](http://viewer.ohif.org/))
+
+![OHIF Viewer Screenshot](../assets/img/viewer.png)
+
+The Open Health Imaging Foundation intends to provide a simple general purpose DICOM Viewer which can be easily extended for specific uses.