provide examples for "provider/supplier/manufactuer/author" roles re: different types of BOMs

[ashleygwilliams]

during the specification review, @mrutkows and i discussed wanting to provide examples for the various "role" categories in the spec. Matt had the great idea to do this per BOM type (section 6 of the spec) and to make graphics for these.

[jkowalleck]

see also: https://github.com/CycloneDX/bom-examples