Add templates for documentation compliant to MIL-STD-498

Templates replicate original standard. It was developed by US government agency and is therefore in Public Domain.

Source of templates: kkovacs/MIL-STD-498-templates-html@7d0e49e02c0907c2d9b6e75720c42e2a2e58e114. I've conveted
templates from HTML to TeX using pandoc