Create infrastructure for architecture documents in Markdown

docs/architecture/.gitignore

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+*.html
+*.pdf

docs/architecture/Makefile

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+PANDOC = pandoc
+
+default: all
+
+all_markdown = \
+	       # This line is intentionally left blank
+
+html: $(all_markdown:.md=.html)
+pdf: $(all_markdown:.md=.pdf)
+all: html pdf
+
+.SUFFIXES:
+.SUFFIXES: .md .html .pdf
+
+.md.html:
+	$(PANDOC) -o $@ $<
+.md.pdf:
+	$(PANDOC) -o $@ $<