Add board_variant_architecture.md
Add board_variant_architecture.md

Ported from Wiki usng pandoc :  pandoc -s --toc --toc-depth=5 -r
mediawiki "C:\Board_Variant_Architecture_convert.txt" -t markdown_github
-o "C:\markdown output3.md"

majenkotech/chipKIT-core,adamwolf/chipKIT-core,adamwolf/chipKIT-core,EmbeddedMan/chipKIT-core,pontech/chipKIT-core,ricklon/chipKIT-core,chipKIT32/chipkit-core,chipKIT32/chipkit-core,majenkotech/chipKIT-core,adamwolf/chipKIT-core,EmbeddedMan/chipKIT-core,EmbeddedMan/chipKIT-core,pontech/chipKIT-core,majenkotech/chipKIT-core,EmbeddedMan/chipKIT-core,EmbeddedMan/chipKIT-core,ricklon/chipKIT-core,adamwolf/chipKIT-core,adamwolf/chipKIT-core,majenkotech/chipKIT-core,majenkotech/chipKIT-core,ricklon/chipKIT-core,pontech/chipKIT-core,EmbeddedMan/chipKIT-core,chipKIT32/chipkit-core,majenkotech/chipKIT-core,majenkotech/chipKIT-core,ricklon/chipKIT-core,pontech/chipKIT-core,pontech/chipKIT-core,chipKIT32/chipkit-core,ricklon/chipKIT-core,chipKIT32/chipkit-core,pontech/chipKIT-core,adamwolf/chipKIT-core,pontech/chipKIT-core,adamwolf/chipKIT-core,EmbeddedMan/chipKIT-core,ricklon/chipKIT-core