primitiveMaker documentation

[Chris Double]

A while back I did some Freetype wrappers using primitiveMaker [1]. I
mentioned I'd write up some notes but didn't get to it. Some
discussion in github issues about primitiveMaker reminded me to put
something up:

https://github.com/russellallen/self/wiki/primitiveMaker

Please add to it if you can. It's currently a combination of the
comments in primitiveMaker, various C++ header files and examples.

[1] https://bluishcoder.co.nz/2015/01/08/improving-linux-font-support-in-self.html

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