WIP standard shader guide;

guides/Standard_Shader.md

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+Standard Shader
+===
+
+LÖVR has a built in "standard" shader that uses physically based rendering (PBR) techniques, which
+can be used to render realistic materials.  This material system is used in lots of engines and it's
+the default material type in glTF, making it easy to import pretty assets and use them with LÖVR.
+
+This guide will show you how to create a LÖVR project that imports PBR assets and renders them using
+the standard shader.
+
+Models
+---
+
+The glTF model format is perfect for the standard shader because glTF uses PBR materials by default.
+LÖVR can import these models and their materials without any extra setup required.  Here are a few
+places to get glTF assets:
+
+- [Official glTF sample models](https://github.com/KhronosGroup/glTF-Sample-Models)
+- [Sketchfab](https://sketchfab.com)
+- [Blender](https://www.blender.org) can export to glTF
+
+To add a model to a project, copy its glTF file (and any accompanying .bin files or textures) into
+the main LÖVR project folder.  From there, the glTF file can be loaded using `lovr.graphics.newModel`
+in `lovr.load`.
+
+Skybox
+---
+
+TODO
+
+Shader Setup
+---
+
+TODO
+
+Tips
+---
+
+TODO