This commit contains a markdown file for a "hello triangle" tutorial
as well as a Python script that does two things:
1) Extracts JavaScript code blocks from the markdown to generate the
code for the demo.
2) Converts the markdown into a nicely-rendered web page.
After we invoke the Python script for the first time, it will create
a set of files in the root docs folder, which will automatically be
published via GitHub Pages to the following URL.
https://google.github.io/filament/webgl
This gives us an official place to host the latest web demos and
tutorials.
The tutorial can be previewed
[here](https://prideout.net/prototype/webgl/tutorial_triangle.html).
More JavaScript tutorials are forthcoming.
