Add documentation about riscv-coq HOT 2 OPEN

Thanks for starting this, see also my comment at Columbus240@0387c87#r33765552

Primitives.v is just an alternative interface to the spec which is more suitable for the bedrock2 compiler.

I think .md files for a general overview are good, and coqdoc comments for noteworthy points about certain code features as well. I personally never read coqdoc-generated html files, but if a .v file contains good coqdoc comments, I appreciate it.

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I rebased my branch, put in your paragraph and added a few words about PrimitivesParams.
I believe now, a general overview like this should be fine for an interested reader of this project. The rest should be possible to find out by studying the code.

If I come up with something relevant for the docs, I’ll add it. After finishing the doc branch, merging it and nothing new coming up, I consider this issue closed.

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