Adding a demo gif and initial README

README.md

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+![TerrainMesh Demo](/terrainMeshDemo.gif?raw=true "TerrainMesh Demo")
+
+# TerrainMesh
+
+**TerrainMesh** is a [SCNNode](https://developer.apple.com/reference/scenekit/scnnode) subclass which aims to simplify the creation of custom **SceneKit** geometry for triangle meshes.
+
+It was created as a simple / fun exploratory demonstration of deformable SceneKit terrain, which can be manipulated on a per-vertex basis.
+
+## Related Article
+
+For a more in-depth explanation of this class and how to use custom geometry with SceneKit, see the blog post here: [http://sound-of-silence.com](http://sound-of-silence.com)
+
+## Performance
+
+The TerrainMesh class can be used as-is for a variety of purposes including terrain generation or manipulation, but it is by no means the most efficient or practical way of achieving this. For more links on the topic, please check out the blog post linked above.
+
+## Author
+
+**Matt Reagan** - Website: [http://sound-of-silence.com/](http://sound-of-silence.com/) - Twitter: [@hmblebee](https://twitter.com/hmblebee)
+
+## License
+
+Source code and related resources are Copyright (C) Matthew Reagan 2016. The source code is released under the [MIT License](https://opensource.org/licenses/MIT).