Add a README so the index file shows up in Gitlab

README.md

+# Welcome to the IoT Lab Manual
+
+Welcome to the home of the IoT Lab Manual. This documentation is
+published and maintained using [mkdocs](http://mkdocs.org).
+
+The IoT Lab Manual will guide you on the tools, components and
+equipment available as a part of the lab and how to use them.
+
+Please do read this manual carefully. It is good to familiarise yourself
+with the contents of your IoT kit along with the corresponding
+safeguards before you venture out to use it.
+