Added intro to the README, explaining the background of the project
StereoKit is a lightweight low-dependency C# rendering library for MR / AR / VR / Desktop using OpenXR!
+As [SharpDX](http://sharpdx.org/) and many other render libraries for C# are sadly deprecated and no longer in development, there are plenty of engines and interfaces out there for rendering in C / CPP, but much less for creating 3D projects with C#. StereoKit tries to fill that gap.
+
+StereoKit offers a modern C# interface for high performance 3D rendering, specifically for Mixed Reality (AR, VR) applications. It also provides (currently basic) functionality around asset management and input handling.
+
+StereoKit is based on OpenXR to enable targeting a wide array of hardware platforms.
+
## Tested platforms
