Added submodule contents into tree

externals/mbedtls/docs/proposed/Makefile

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+PANDOC = pandoc
+
+default: all
+
+all_markdown = \
+	       psa-conditional-inclusion-c.md \
+	       psa-driver-developer-guide.md \
+	       psa-driver-integration-guide.md \
+	       psa-driver-interface.md \
+	       # 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 $@ $<
+
+clean:
+	rm -f *.html *.pdf