WebGL - How to use a point light

In this episode, I discuss point lighting in the vertex shader for webgl.

Concepts:
* Lighting
* Surface color by diffuse reflection = light color * base color of surface * cos A
* Diffuse reflection = reflection differs by light position
* Angle(A) = between the light and surface
* Surface color by ambient reflection = light color * base color of surface
* Ambient reflection = same reflection at any position
* Surface color by diffuse and ambient reflection = surface color by diffuse + surface color by ambient

Resources:
* https://github.com/davidwparker/programmingtil-webgl/tree/master/0076-lighting-part-5-point-light

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